Leigh Erwin: Racking Mead

Leigh ErwinHi everyone!
Just finished a successfully racking my mead.  Well, I think it was successful—nothing ended up on the floor anyway.
I also decided to rack the mead into my plastic carboy from ECKraus instead of back into the glass carboy, as I think the glass one I have is a little bigger than my plastic one and I wasn’t as comfortable with the amount of head-space that left compared with how much is left when it’s in the plastic carboy.
When I checked the specific gravity of the mead right before it was racked, it was 1.000.  A little higher than I’d like still, which indicates to me that perhaps I have a stuck fermentation?  Just a little stuck though, since it’s nearly done?  When I racked it, there was almost no sediment on the bottom (this is the second time I’ve racked the mead—there was a lot of sediment the first time).  From what I’ve been reading online, I THINK it means there are still some yeasts in there (which I can taste) but they are stuck in “Never Never Land”.
Looking around the internet, it sounds like there are a bunch of different options.  Figuring out which option is best for my mead is what the issue is.
Shop Yeast EnergizerSome are saying to add more yeast along with some yeast nutrient or yeast energizer.  I’m hesitant to do this, as I am not yet convinced that the remaining yeasts are dead, I just think they are a little tired and worn out and in need of a boost.
Some were saying things about temperature, however, other than changing the temperature of the entire apartment, I don’t really have a good way to do this right now.
I think what I’m going to do is just add a little yeast nutrient and/or energizer, to see if whatever remaining yeasts are in there will get their little butts in gear and finish out that remaining 0.002 on the specific gravity scale!  I’m also hoping that this will help with the clearing up process, as the mead did not clear up even in the slightest between when I racked the mead today and when I had racked the mead a few weeks ago.

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My name is Leigh Erwin, and I am a brand-spankin’ new home winemaker! E. C. Kraus has asked me to share with you my journey from a first-time dabbler to an accomplished home winemaker. From time to time I’ll be checking in with this blog and reporting my experience with you: the good, bad — and the ugly.

What Does Mead Taste Like?

Glass Of MeadI know nothing about mead. What does mead taste like? Dry or sweet.
Jerre — TN
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Hello Jerre,
This is a very loaded question because there are is such a wide varieties of meads. There are meads made with herbs or spices added in addition to the honey (metheglin). There are meads made with the fruit (melomel). You can mix honey with apple juice to make a cyser. You can also mix honey with grape juice to make a pyment. This list goes on and on. This makes it hard to answer the question: “What does mead taste like?
Not all honey is the same, either. What the bees use to spin the honey can make a great difference. There’s apple blossom honey, clover honey, buckwheat honey, tupelo honey… Again, the list is endless. The source of nectar will have an effect on the resulting mead. The cheapest, generic honey will be wild flower honey.
Just like any wine, mead can be made sweet or dry. This is completely up to you, based on your personal preference. It is simply a matter of sweetening to taste at bottling time with sugar, more honey, or anything else you’d like to experiment with. A wine stabilizer (potassium sorbate) should be added at the same time to prevent the chance of a re-fermentation in the bottle.
The point here is that there are an extremely wide range of flavors that can be experienced when drinking meads. For this reason putting a good description as to what a mead tastes like is almost impossible. It is similar to the question, “what does a grape wine taste like?” The flavors vary to greatly to encapsulate in a few words or paragraphs and there is nothing to accurately compare it to.
Shop Wine ConditionerHere’s what I will say, all meads do have a subtle core flavor or character that can be identified. There is a flavor of honey. If it is a dry mead, imagine what honey would taste like without the sweet. Now take that flavor and imagine what it would taste like with the heat of alcohol. This is the best possible way I can think of to answer the question, what does a mead taste like? However ,I do confess that this is completely inadequate.
If you need more description than this, I would suggest buying a bottle. Actually taste a mead for yourself before expending time and effort on making your own mead. There is no other way to really know what a mead tastes like other than to try if for yourself. In my personal experience there is nothing to hate about a mead. I find most meads very pleasant and some even interesting. I also like to use honey two back-sweeten my other wine or to raise the potential alcohol of my other wines. Here’s a mead recipe to get you started.
Best Wishes,
Ed Kraus
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Ed Kraus is a 3rd generation home brewer/winemaker and has been an owner of E. C. Kraus since 1999. He has been helping individuals make better wine and beer for over 25 years.

Leigh Erwin: Sampling My Mead

Woman Sampling A MeadHi everyone!
I was very curious to sample my mead, which as you may already know has been sitting around in a carboy for goodness knows how long (read: months).  I have had to put the wines on the back burner for now, as my life is just insane (good insane!) right now and something needed to go by the wayside for a short period of time.
I realized I hadn’t made a batch of sterilizing solution for my winemaking equipment in a while, so I dumped out the old stuff, then made some new stuff using a teaspoon of sodium bisulfite and a gallon of water.  Now that tickles the nose just a bit when dissolved, so I know it must be working!
I just stole a little sample of the mead from the carboy with my make shift wine thief (it’s just a turkey baster- ha!) and gave it a little taste.  Now, I’m still not a huge fan of the nose, as it smells kind of yeasty to me, but I’m thinking that’ll change after it goes through a wine filter.  I hope…
Tasting the mead, I actually don’t think it’s too terrible.  Again, I have no experience with mead during the winemaking process (only the finished product!), so for all I know, it could be disgusting crap.  To me and my fiancé though, it’s actually not that bad and once I add a little sugar back I’m sure it’ll be just fine for the two of us. (Now 10 minutes later, I don’t have any nasty after taste in my mouth, so that’s a good sign, right?).
Shop pH Testing StripsI checked the specific gravity again, and it does look like it dropped a teeny weeny little bit to 1.000.  It’s still not exactly where I was hoping it would be, but at this point I might say “screw it” and continue on with the process.  You might recall, I had tested the acid at one point, but the results were somewhat inconclusive since learning after the fact that you can’t really test the acid this way for mead—oops.  Maybe what would be better is testing the pH, but I foolishly did not buy any of those pH testing strips this time.  That would be an excellent investment for sure, particularly since they are so cheap and easy to use!
Anyway, after sampling my mead I’m not too disappointed, so I think I’m going to rack the mead at least one more time, and then order some clarifying agents to speed that puppy up a little faster.  After it’s clear (or clear enough), I’ll run it through my new wine filter and bottle!

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Leigh ErwinMy name is Leigh Erwin, and I am a brand-spankin’ new home winemaker! E. C. Kraus has asked me to share with you my journey from a first-time dabbler to an accomplished home winemaker. From time to time I’ll be checking in with this blog and reporting my experience with you: the good, bad — and the ugly.

Why Is Your Homemade Wine Spoiling?

Man With Wine That's Been Spoiling.Hi, I have two one gallon batches of wine going. One is blueberry and the other is muscadine. They both smell and taste soured. What is wrong?
Brandon A. — NC
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Hello Brandon,
It’s really hard for me to know exactly what you did wrong, if anything. What I can tell you is there are two key reasons for a homemade wine spoiling:

  1. The number one reason for a wine spoiling is because sulfites were not used in the winemaking process — sulfites such as Campden tablets or potassium metabisulfite. Skipping the use of sulfites does not guarantee that your homemade wine will go bad, but it does increase the chance of this dramatically.
  2. The number two reason for a wine spoiling is that the fermentation vessels and equipment were not sanitized. They may have been washed in soapy water, but not sanitized with something like Basic A or Cleanpro SDH. Soap will get the grime off the surface of the equipment, but to destroy all traces of mold and bacteria that can later grow and take over a wine, you need to use a cleanser of some sort.

The absence of sulfites and cleansers in the winemaking process is the reason almost all wines spoil. They are fundamental and should always be used when making wine.
Shop Potassium BisulfiteAnother reason a homemade wine can start spoiling is if the fermentation is not strong. You can sanitize everything and add sulfites to the wine must before fermenting, but all this is futile if the fermentation does not take off quickly and fully. A wine must that is sitting still for several days is a prime target for being taken over by molds, bacteria and other little nasties that might be floating in the air. The wine must is packed with nutrients and sugar. What more could a contaminant ask for?
This is one of the reasons you do not want to rely on wild yeast to ferment your wine. As a home winemaker there are too many other airborne microbes competing with the yeast for a place to colonize. You want to use domesticated wine yeast so that it has the upper-hand. The yeast cell count will be greater and the yeast more vigorous. Once you have a solid fermentation, mold and bacteria will not stand a chance. It’s analogous to having a solid stand of grass in your yard to help keep the weeds down. A strong fermentation keeps the contaminants down.
Shop SanitizersThe last thing I’d like to bring up is that your wines may be perfectly fine. If this is your first time making wine, it may be that you have not experience what a fermentation smells and taste like and are just mistaking the usual odors for the wine spoiling. During a fermentation you should be smelling the fruit used to make the wine, but you will often times also experience a sulfur smell from the fermentation — sometimes like a freshly boiled egg. I’m not saying this is what’s going on, I just wanted you to be aware of this.
It you are correct and your homemade wine is spoiling, one thing you can be assured of is it will get worse. If it is not spoiling, then you will notice the symptoms getting better, until eventually you end up with a great tasting wine. At this point there is little you can do. If the fermentation has finished you should be adding a full dose of sulfites. But, other than that it’s a wait and see proposition. There is nothing you can do to reverse any effects. Time will take care of this homemade wine if is still fresh and not spoiled.
Best Wishes,
Ed Kraus
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Ed Kraus is a 3rd generation home brewer/winemaker and has been an owner of E. C. Kraus since 1999. He has been helping individuals make better wine and beer for over 25 years.

Leigh Erwin: Wine Is Patient Too

Homemade wine being patientWhen winemaking gets left on the back burner….
One nice thing about making homemade wine is that there are stages where you can just leave your homemade wine sitting in a carboy for weeks and months on end when your life gets a little crazy, and the wine should theoretically be just fine!
I’m definitely at a stage in my life right now where making homemade wine has sadly taken the back burner to everything else, though it is still constantly there in the back of my mind just excitedly waiting for me to make it a priority again!
You see, I’m getting married in less than a month, and I’m making/doing A LOT for the wedding, so of course that takes priority over the poor little carboy filled with mead.  Also, I am leaving my full-time “day job” in one week from now, so at least after that I SHOULD be able to do a little bit more here and there before all may homemade mead evaporates into thin air!
Shop Grape ConcentrateThat being said, it would be nice to finish this mead prior to moving, but depending upon how things go, I’m not sure if that’s going to happen.  It’s still just as cloudy as it was, though I’m not surprised because everything I’ve read says mead takes a million years to clear up.  I tried testing the acid of the mead a little while ago, and STILL haven’t done anything to follow up with that yet, but I do happened to have a little extra time today while I’m not up to my elbows in wedding hullaballoo that I can actually taste it and maybe make some adjustments.
Worst case scenario: I end up moving the mead while still in the carboy.  That’s OK—I’ll just make sure it rides with me in the car, buckled up, and well cushioned against possible mishaps!
Have you ever had life get in the way of making homemade wine?  It’s hard to find a balance sometimes!

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Leigh ErwinMy name is Leigh Erwin, and I am a brand-spankin’ new home winemaker! E. C. Kraus has asked me to share with you my journey from a first-time dabbler to an accomplished home winemaker. From time to time I’ll be checking in with this blog and reporting my experience with you: the good, bad — and the ugly.

Moving Homemade Wine Cross Country

Two Carboys Of Wine That Need To Be Moved Across CountryHi there, I have to say, thank you for the amazing site. It’s been a wealth of knowledge… I will hopefully be moving cross country in the next few months. Currently I have two wines I am in the process of making… My questions are what would be the best way to transport a possibly bulk fermenting wine? If they are done fermenting am I safe to degas the wines, then plug the carboys and move or should I add something to either of them? As a side note, I do plan on making crates to protect the carboys…
Isaac — WA
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Hello Isaac,
There are several concerns when moving homemade wine cross country: sunlight and temperature being my two biggest ones. Both of these promote oxidation in the wine. This is where a wine starts to take on a brownish or orange-like tinge, and the wine’s flavor starts to take on a bitter, raisin character.
You will want to keep the wines out of direct sunlight. You also want the wines’ temperature to stay consistent. The cooler the better. This will help to slow down the oxidative process, but i understand you can only do what you can do.
You can move the wine in carboys — degassed and sealed up tight — but if the wine warms up just a few degrees, it can pop the rubber stopper out of the carboy. Six gallons of wine can easily expand enough from any warmth to push out a stopper.
Shop Grape ConcentrateYou can wire down the stopper with some bailing wire. If the wine warms up a few degrees you should be fine, but if the wine warms up excessively, you could be building up considerable pressure in the carboy, which is never a good thing. Having a carboy fail is not unheard of in such situations.
Sediment is another concern when moving homemade wine cross country. The ideal situation is for all the sediment to be gone before moving. In other words, the wine has cleared up completely and is not depositing any new sediment. You have also removed the wine from all the sediment that has occurred.
Leaving the sediment in the carboys while traveling can promote a process call autolysis. This is when some of the live yeast cells start consuming some of the dead yeast cells. The result is a wine that starts to take on a nutty / to bitter / to metallic flavor. It is something that occurs to some insignificant degree in any wine, but when the sediment is contentiously being stirred up by the constant vibration of traveling, the amount of autolysis can become excessive.
Here’s What I Would Do If I Were Moving Homemade Wine Cross Country…

  1. Have the wine cleared and degassed. You would like to have the wine this far along in the winemaking process.
  2. Put the wine in carboys. The carboys should be topped-up. You do not want excessive head-space. There are several ways you can eliminate head-space in a carboy. Having excessive air in with the wine will help promote oxidation, as well.
  3. Add a dose of sulfite. This could be Campden tablets, potassium metabisulfite or sodium metabisulfite. Use 1/16 of a teaspoon per gallon or 1 tablet per gallon of wine. Sulfites will go a long way in help to reduce any effects of oxidation and help to keep the wine from from oxidation.
  4. Seal the carboys with an actual tapered cork stopper. Cork will allow some pressure to release if it built up. A rubber stopper will not give at all. A tapered cork stopper will breath a little.
  5. Wire down the tapered cork stopper with bailing wire. This can be done by going around the neck of the carboy with the wire, then running one strap of wire over the top of the cork stopper and securing the end.

Your idea of putting the carboys in crates is a good idea. You can never be too protective particularly when moving your homemade wine cross country.
Good luck to you. I hope this was the information you was looking for.
Happy Winemaking,
Ed Kraus
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Ed Kraus is a 3rd generation home brewer/winemaker and has been an owner of E. C. Kraus since 1999. He has been helping individuals make better wine and beer for over 25 years.

Leigh Erwin: Mead Acidity – Pt. 2

Using Acid Test Kit  On A MeadHi everyone!
I just wanted to follow up a little more on this issue of using the acid test kit to test the acid levels in my mead.
As a reminder, from my last post the results of the acid test showed that my mead has 0.725% tartaric acid and 4.64ppt sulfuric acid.  I calculated the TA (titratable acidity) to be 4.35g/L, based on instructions found online.  According to some forums I’ve read online, measuring the titratable acidity using the acid test kit method may not be accurate for mead, since the sugars and other compounds in mead react a lot differently than those found in white and red grapes or fruit wines.
Here are some more details that I discovered about mead and how problematic it is to test the acid:
The issues are related to the unique chemistry of the honey used to create the mead.  Instead of tartaric acid, gluconic acid is the dominant acid in mead.  Where the issue lies is that in mead there is also a compound called gluconolactone that converts to gluconic acid as the pH level rises.  If you think about it, when you’re running an acid titration on a mead, you’re adding a strong base (sodium hydroxide) to your acidic solution, thus increasing the pH of the sample.  So, by adding the sodium hydroxide, the gluconolactone in the mead will actually convert to gluconic acid as the pH naturally rises during the process.
Shop 3 Gallon CarboysYou basically end up having to add a lot of “extra” sodium hydroxide to the sample, since acid continued to be created during the process instead of measuring ONLY the acid that was in there prior to the start of titration.  Too much base means that you are effectively overestimating the amount of acid in your mead.
If this is correct, that means the actual titratable acidity level in my mead is lower than 0.725%, but how much lower, I’m not sure.  I foolishly did not taste the wine this time around, but it still had that “odd” smell it had previously.  I’m thinking maybe the acid levels in my mead are actually too low?  What I should really do is taste the wine again, maybe add a little acid blend, then taste again a few weeks later?
What do you all think?  Am I on the right track thinking this way about using an acid test kit on a mead?  Or am I totally off my rocker?
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Leigh ErwinMy name is Leigh Erwin, and I am a brand-spankin’ new home winemaker! E. C. Kraus has asked me to share with you my journey from a first-time dabbler to an accomplished home winemaker. From time to time I’ll be checking in with this blog and reporting my experience with you: the good, bad — and the ugly.

Walt's Idea For Topping-Up Wine With Carbonated Water

Walt From ArkansasI have been thinking about a way to protect wine from unnecessary oxidation during 2nd and 3rd rackings. Mainly, I want to get the oxygen out of the empty carboy before racking into it, but how? CO2 cartridges? Dry ice? Finally hit upon a simple idea. Since I have to top up with water anyway, why not do the “topping” first, with carbonated water. The escaping CO2, being heavier, will drive everything else out of the carboy. What do you think?
Walt — AR
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Hello Walt,
If I am understanding you correctly, you are saying to put any carbonated water needed for topping-up the wine into the empty carboy — first — before racking the wine into it. And, letting the CO2 gas from the water drive the air out of the fermenter. You would be estimating the amount of carbonated water needed for topping up.
I commend you on your idea!
In theory, what you are saying it correct. The CO2 would slowly drive air out of the vessel. The main issue I see is getting enough of the CO2 gas to release to have any real results.
Assuming you only need to top-up the wine with a quart or less of water in a 5 or 6 gallon batch, the amount of CO2 in a quart of carbonated water is not all that great. If you need to top-up the wine with a greater amount of water than this, then you shouldn’t be topping up with water at all, but rather a similar wine or some other method. Here’s some more information on different ways for topping up a wine.
Absolutely, the carbonated water would drive some of the air out of the fermenter, but not nearly all of it. There’s just not enough of it in a quart or less to do the job completely.
The second issue is getting all the CO2 gas to release from the water. Only a portion of the gas will release through agitation. The rest will want to stay saturated in the water. One way to get the CO2 gas to release more completely from the water would be to make sure it’s warm. The CO2 gas will release more freely from warm water than cold.
Having said this, I do not see any problems with putting carbonated water in the fermenter for topping-up the wine. It will be effective in driving out some air, just marginally so.
Shop Potassium MetabisulfiteI personally have never concerned myself with purging air from my fermenters when racking. The amount of contact time with the air is not enough to oxidize the wine in any way. Oxidation takes time. The one thing you do have to look out for is splashing. You do not want the splash the wine with racking. Fill the fermenter from the bottom up. That is, have the hose reach to the bottom of the fermenter being filled so that the hose is in the wine during the racking and not splashing.
Secondly, if [the fermentation has completed, and] you add sulfites such as Campden tablets or potassium metabisulfite to the wine after racking — as you should — you will be driving any air out of the wine and replacing it with SO2 gas in a matter of minutes.
There is nothing wrong with topping-up your wine with carbonated water. I just don’t think it will be affective in purging the air out of the fermenter.
Happy Wine Making,
Ed Kraus
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Ed Kraus is a 3rd generation home brewer/winemaker and has been an owner of E. C. Kraus since 1999. He has been helping individuals make better wine and beer for over 25 years.

Leigh Erwin: Mead Acidity – Pt. 1

Testing Mead AcidityHi everyone!  I hope all your home winemaking adventures are going well!
For me, I have to admit I’m somewhat confused… It has to do with mead acidity.
Backing up a second, one thing that did happen this week was that I got the shipment I ordered from ECKraus.  I ordered several items, including a new floating thermometer to replace the “sticker” one that I had previously, the Pressurized Wine Filter system, a couple of filter pads to fit in the filter system I purchased, a longer racking cane from my slightly taller carboy, and finally the Acid Test Kit.
Why am I confused?  Well, it’s related to the results of the Acid Test Kit when testing my mead.  I wanted to test it to see if there was something off about the acid levels, since the specific gravity has stopped at 1.002 (still that value when I tested the acid).  I figured I’d check the acid levels of the mead to see if maybe that needed some adjustment before moving forward, or if it’s just simple matter of jump starting any remaining yeasts.
Well, the results of the acid test showed that my mead has 0.725% tartaric acid and 4.64ppt sulfuric acid.  I calculated the TA (titratable acidity) to be 4.35g/L, based on instructions found online.
On the acid test kit instructions, it gives recommendations for different types of wine in terms of what the % tartaric and ppt sulfuric acid should be.  For white grape wine, they recommend a range of 0.65-0.75 tartaric and 4.2-4.9 sulfuric.  For red grape wine, they recommend a range of 0.60-0.65 tartaric and 3.9-4.2 sulfuric.  Finally, for fruit wine, they recommend a range of 0.55-0.65 tartaric and 3.6-4.2 sulfuric acid.
Here’s where my confusion lies:
I’m not making white, red, or fruit wines.  I’m making mead!  What in the world are the recommended acid ranges of tartaric acid and sulfuric acid for mead? Do I count it as a “white wine” because that’s what it most closely resembles?  No, that can’t be right.  It’s honey, no grapes!  Different chemistry.
Well, after a nearly fruitless search through Google, I could barely find anything that even remotely hinted at what mead acidity levels I should be looking for.  After a while, I did find a page that discussed how measuring titratable acidity in mead was actually often highly inaccurate and not a trusted way to determine acid levels in honey wine.  It is basically related to the types of sugar found in honey versus the types of sugar found in grapes or other fruits (namely: gluconic acid/gluconolactone).  Supposedly, the sugars and other compounds in the mead react much differently than those in grape or fruit wine, thus significantly skewing the true results.
So, does this mean I just wasted my time using the acid test kit to test my mead’s acidity?  Well, I think it depends on how you look at it.  It might not be the best measure for acid in mead, but at least I got to practice how to perform the test!  I’m going to have to dig a little deeper on this, I think!
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Leigh ErwinMy name is Leigh Erwin, and I am a brand-spankin’ new home winemaker! E. C. Kraus has asked me to share with you my journey from a first-time dabbler to an accomplished home winemaker. From time to time I’ll be checking in with this blog and reporting my experience with you: the good, bad — and the ugly.

Help! Wine Bottles Exploding When Opened!

A Wine Bottle ExplodingI made a blend of apple and plum wine from fruit from my trees in the backyard. I followed a very commonly used wine recipe on the web and it was bottled at 6 mo old in April. We drank the wine and it tasted good up until this week. The wine bottle we opened exploded like champagne and was a little sour. We opened the final 4 wine bottles left and they all exploded. What could be causing this? I used Campden tablets as recommended by the wine recipe to prevent spoilage. Your help is appreciated!
Connie — WI
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Hello Connie,
Your wine bottles exploding was caused by either one of two things: 1) the wine started fermenting again after being bottled, 2) the wine started spoiling, producing a bacterial growth. Without question it was one of these two things. The bigger question is why…

  • If you added more sugar before bottling, then more than likely it is a matter of the fermentation starting up again — even if you added Campden tablets at bottling time. Campden tablets are not enough to guarantee that a re-fermentation will not occur again sometime down the road. Whenever sugar is added to sweeten the wine, potassium sorbate should also be added along with the Campden tablets.
  • If you did not add more sugar before bottling, it is possible that the original fermentation did not finish completely. In other words, the fermentation stopped prematurely. This can happen for a number a reasons — the most common being a temperature change of the wine must. This is known as a stuck fermentation. The yeast did not finish the job completely before stopping. Then, weeks or month later, after the wine has been bottled it decides it will start up again. The result is your wine bottle exploding.

Again, the fermentation can stop and start for a number of reasons, but the most common one is because of a change in temperature. The wine bottles probably warmed up a bit making it easier for the wine yeast to start fermenting again. Just 5° or 10° is all that is needed. Just as before, Campden tablets added at bottling time is not enough to guarantee that you won’t have your wine bottle exploding.
Shop HydrometersIn the future, the easiest way to make sure that you don’t have a stuck fermentation is to check it with a hydrometer. The hydrometer will tell you if there are more sugars in the wine must to be fermented, or if all the sugars are gone, and the fermentation has actually completed the job at hand, and using a hydrometer is very easy.
If none of the above is ringing any bells or if you did check your wine with a hydrometer before bottling, then it is possible that the wine bottles exploding was caused by a bacterial infection of some sort. This is not the likely scenario, but it can happen.
If you know that there was no sugar in the wine at bottling time, whether it be leftover from the fermentation or sugar you added for sweetening, then a bacterial infection could be what’s going on. The one paramount factor that would rule this out is if you added Campden tablets right before bottling. Campden tablets or sulfites of any kind would easily preserve the wine from such a bacterial infection.
Wine bottles exploding is something that nobody wants to have happen, but it is completely preventable. Just be sure that if there’s sugar in the wine at bottling time — whether it be from leftover from the fermentation or sugar you’ve added — that you add potassium sorbate to the wine. This would be in addition to the Campden tablets that should always be added. Do these things and you will not have wine bottles exploding.
Best Wishes,
Ed Kraus
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Ed Kraus is a 3rd generation home brewer/winemaker and has been an owner of E. C. Kraus since 1999. He has been helping individuals make better wine and beer for over 25 years.