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Is it mold? (More pics in body)
(thelemmy.club)
Raspberry peanut butter mead, this happened after racking into tertiary. Primary and secondary had raspberries freefloating in the container, so it miiiight just be floating bits of raspberry. When I shake it up, they briefly sink and float back up.
Funny thing is, apparently, yeast can metabolize fat - according to Dr. White, they can use available fat instead of synthesizing their own using oxygen on growth stage to build new cell walls. It's not a lot of fat they need though, but quite measurable amount, and only on exponential growth.