I have brewed about 10 -1 gallon AG batches so far, and have always had a cabinet that I could stash my fermentor in to keep it out of the light. I just brewed my first 5 gallon batch, and living in a small house in Florida, without a fermentation fridge, I have to keep my carboy in my living room. At first I used a thick moving blanket to wrap the carboy, but that seemed to insulate it and bring the fermentation temp up. I found a navy blue pillow case with a high thread count (1 ply blocked light pretty well when I tested) and cut a hole in the sealed end and slipped over my carboy. My question: will this pillow case block enough light? Has anyone tried this before?
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