DIACETYL
FROM WHITE RUM CANE · the butter note
The butter note. Wanted in oak-aged Chardonnay and certain ales (English bitter, Czech pilsner) where a controlled amount adds body; unwanted at high concentrations, where it slides into movie-theater-popcorn territory. Yeast produces it as an intermediate during fermentation and reabsorbs it during conditioning. A rushed beer that skipped its conditioning rest often carries diacetyl as an off-flavor the brewer didn't intend.
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