I brewed a hoppy red ale on Tuesday and pitched some washed wyeast 1084 into it that evening. I had an og of 1.070 and went ahead and put a blowoff tube on the fermenting bucket in case I had a huge krausen. I did not see any fermentation bubbles, and later realized that the seal was not as tight as I thought it was between the tube and bucket lid. Today put in a regular airlock and noticed a strange green scaley looking growth on the top of my beer. Is this some sort of contamination? A picture is attatched...! I'm new to the site so i can't post the picture on here. However, you can check out my HBT post with the pic here http://www.homebrewtalk.com/f163/contamination-whats-305419/ Thanks!

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  • I added the picture. It's a good example of krausen for other beginners to see. – mdma Feb 18 '12 at 11:53
  • How do I upload an image to a post on Meta provides step by step guide to inserting images. – mdma Feb 18 '12 at 15:31

This is normal. It's krausen - bits of yeast, hop particles and oils, trub and proteins floating on top of the beer - and a sign of healthy fermentation.

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    Looks like a "mostly done" krausen. The green ring on the sides of the bucket is a high water mark, showing how tall the krausen was at its peak. – FishesCycle Feb 18 '12 at 15:33
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    I agree Tobias - at first glance I thought the white parts (the bucket) was white from the krausen. Then it would have been a new krausen, but this here has almost all fallen back in, so it's a "I'm pretty much done, but leave me alone for a bit to condition" krausen. – mdma Feb 20 '12 at 20:06

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