How much wheat? The only beers I brew with wheat are weizens and they use 50-67% wheat malt and I have had head problems with them in the past. I haven't been able to narrow down the exact reason why but I'll relate what I've observed. The first few weizens I ever brewed employed a protein rest and they had a mousse-like head. Then for some reason the next few batches lost their head even though my process remained the same. At that point I dropped the protein rest and have had thick moussy heads ever since.
I could be wrong - and if so then someone can correct me - but I read someone on here a while back talking about protein rests being bad for highly modified malts. Did you change your source of wheat malt when you first lost the foamy head?
+1 for a clean glass.
I thought that this was s*#t until I realised one night while poring my old man a beer, the glass I use every night and rinse after use, had NO head while Dad's glass had head galore. And the head was perfect right to the last drop.
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