Hi all, I'm not sure if this is the right place to post this but I thought I'd give it a shot. I'm new to homebrewing and so far have successfully brewed many gallon batches of beer. I decided to try to make some cranberry wine - gallon batch. So, my wine has been in the carboy for a while with an airlock w/sanitized water. Today, I went to bottle the wine and discovered a gross slimy layer of black mold floating on top of the water in the airlock (about a few millimeters thick.) I'm not really sure what to do now. I put a fresh airlock on and held off on bottling until I research it some more. Do you think my wine is contaminated / ruined? The mold was only on the top of the airlock but I worry that spores got into the wine. Fermentation in the wine had completely stopped & the wine smells perfectly fine. So, what do you guys think? Thanks!!!!
I have never experienced mold growth in an airlock. My suggestion is to sample taste your wine and if it tastes OK proceed with bottling. Cheers!
Mold and fermentation do not mix well. You have little choice but to follow Jacks advice. You would probably recognize quickly if the wine was soured, even visually. It seems likely that your airlock was not clean prior to it being placed on the carboy. Mold spores do not crawl, and they would need to be good swimmers to crawl through an airlock under positive pressure (mold can't swim either of course). If you put away the airlock wet, if there were just the slightest bit of food source in there, yeast, hop, trub, just a tiny bit, and it sat that way then mold could find it's way to colonizing. In the future you can mix a little cheap vodka and water and use that in the airlock. There is not really such a thing as "sanitized water". Once the water meets atmosphere it starts getting contaminated so to speak. Know too that if your wort is warm, and you place it in a cold spot with an airlock there is a chance the airlock water will be sucked in, so a bit of vodka is good insurance. Vodka is generally a great way to sterilize, not just sanitize but sterilize. Cheers
My process for airlocks is that I sanitize them and then I just put tap water (municipal water which is chlorinated) in the airlock. This combination has always worked for me. Cheers!
I imagine the material burped up from the fermentation sent your neutral water into a state of bliss and what you are looking at is the result. Unless you got that stuff sucked back through. You're fine. And super lucky.
Same as vodka but no matter what they tell me star san is not the same as 80 proof alcohol. And if it were by chance to be drawn in to my beer no worries. I just like the idea of good old sanitizing alcohol. It is drinkable bleach so to speak. That is how I feel anyway, regardless of best practice. Oh yeah, I like to have a liter of rot gut on hand too. Cheers
Thanks for all the replies. I bottled the wine after giving it a taste ( it smelled and tasted good) I'm definitely gonna use vodka for the airlock next time!!
Mold is ubiquitous. No one should expect their brewery, kitchen, garage or garden to be mold free. But you do not ordinarily see mold. It will colonize to a visible extent if the conditions are right. That is if there is a food source, moisture and reasonable temperatures. If you have mold in your airlock it means the airlock is not clean. That simple. It is no different than if you are getting mold in your glassware in the kitchen cabinet. I want to add that dealing with mold ends at cleaning. You can't quite "kill" mold. You can't sterlize mold. The stuff is incredibly resilient. If you spray mold with bleach you will have bleach. But it can be phyically removed. So clean everything in your brewery. Cheers