After taking my OG, I pull the hydrometer out and cover the cylinder with foil. This sits on the counter for a few days. If it starts to ferment I know that there's a chance that my sanitation was not good. Maybe something wild dropped in during chilling. Whatever, it's not a big concern as long as the main batch starts before the sample. It's just a point of reference in case there's an issue with the finished beer. FG reading always get drank.
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It’s best to brew dark beer at night, because that way the darkness gets into the beer. —Bohuslav Hlavsa
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