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I have a question. This particular brew is a white IPA and brew day was a week ago. I had a violent fermentation the first night after brewing to where a lot of krausen built up, expanded the bucket outwards and spewed a little wort through the airlock. I added ferm cap and resealed the fermenter. It has been fine ever since and krausen has subsided. Gravity dropped to almost FG after just 3 days.

I checked the gravity levels after a few days and noticed a build up around the inside of the fermenting bucket rim near the top. The build up is greenish in color and kind of "gunky" looking. Ironically enough, I also got this same build up in my kettle during game the boil right after I added in the Hops.

Would anyone happen to know of this is normal and what it might be?

I've tried to add a pic, but it's not letting me...maybe size is too big.

Thanks for any help!

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    I believe you need to gain some more reputation before you can post an image. – Philippe Mar 25 '17 at 2:28
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Most probably, it's some hops residue. The krausen must have caused it, and in any case it's not touching the wort so I would not worry about it.

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    Even if it was touching the wort it would be no problem. – Denny Conn Mar 25 '17 at 15:44
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Given the color and location, it's most likely hop residue. Pellets end up disintegrating into mush, hence the use of hop spiders / muslin bags. What yeast are you using that ran through fermentation that fast?

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Slightly cooler pitch temperature and keeping the fermentation temps under 80F will keep the violent krausen to a minimum. This used to be a problem for me and cooler pitch temps have resolved this.

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