Something on the surface of beer

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Newbie123

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Hello

Can anyone help ID what is happening to my beer. It is a Coopers Hop Gobbler. I followed the recipe and the only issue I had was that our heating went out and took a while to fix so fermentation slowed dramatically. All in it took around a month. I opened it a few days ago to take a Gravity and remove the hops bag. Opened to again this morning to begin bottling and found this film on the surface. I hope someone can tell me if this is normal after dry hopping or what it is and if I should dump it or go ahead and bottle? I’ve attached two photos I hope they’re clear enough.
 

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RM-MN

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We call those spots yeast rafts. When the ferment is done the beer has a lot of CO2 dissolved and it begins to slowly bubble out, carrying yeast and trub to the surface where they stay due to the tiny bubbles. Looks pretty normal to me.
 

Coookies58

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I agree there is definitely some yeast, but doesn’t the first pic look like the beginning of a pellicle forming? Looks like a film on top. I’d still keg and try it, but I’d do it quick. What’s the gravity currently?
 
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Newbie123

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I agree there is definitely some yeast, but doesn’t the first pic look like the beginning of a pellicle forming? Looks like a film on top. I’d still keg and try it, but I’d do it quick. What’s the gravity currently?
I have bottled it as the Gravity was at 1.010 the same as a week ago. It tasted fine.
 

jrgtr42

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I have bottled it as the Gravity was at 1.010 the same as a week ago. It tasted fine.
I'm with Coookies in that |I think I see a film pellicle going. I'd give it a week or two to condition and see whta's happenning.
You may want to plan to drink it pretty quickly.
 

GoodTruble

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If it was Cooper's, did you by chance bottle in plastic bottles? If so, squeeze them daily. As soon as there is acceptable carb, put a couple in the fridge to see if it clears any residue off the top. Sometimes fridging it faster can stave off worrisome growths a bit.
 
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Newbie123

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If it was Cooper's, did you by chance bottle in plastic bottles? If so, squeeze them daily. As soon as there is acceptable carb, put a couple in the fridge to see if it clears any residue off the top. Sometimes fridging it faster can stave off worrisome growths a bit.
I’m reusing glass beer bottles ( not a fan of plastic) but I will do a check in a week to see if it’s carbonated and keep an eye out for any surface growth. Any idea what the growth might be? I have a serious penicillin allergy so if there’s any chance I may leave the tasting to my OH.
 

Coookies58

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Penicillin comes from mold, and a pellicle isn’t mold. So that would seem to be out. I’ve never heard of penicillin in beer. Though it’s been shown ancient Nubians brewed a tetracycline beer. Tetracycline however is fine for penicillin sensitive folk. I say drink away.
 

odie

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kinda looks like just old krausen rafts. I would suggest cold crash a couple days. kinda disturb the fermenter to break them up a little up so they can fall to the bottom and compact into the trub so you can rack clear beer. Something as simple as slap the side a bit. The vibrations might be enough to break the surface tension and get them to fall.
 

GoodTruble

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I’m reusing glass beer bottles ( not a fan of plastic) but I will do a check in a week to see if it’s carbonated and keep an eye out for any surface growth. Any idea what the growth might be? I have a serious penicillin allergy so if there’s any chance I may leave the tasting to my OH.
White rings and residue inside the bottles around the top surface can be an early indication (but even that can/will be fine most if the time and not necessarily an infection). If you see noticeable white rings (that seem to have depth or are growing), I would throw a bottle in the fridge to see if that helps. The other thing to watch out for is floaties/unusual debris in the bottles beer.
 
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