Beer Brewing

Over-bitterness that overwhelms the beer’s malt character — harsh, lingering, face-puckering bitterness rather than clean, pleasant hop bite — is almost always a hop utilization miscalculation combined with one of several specific contributing factor

Unwanted haze in beer that should be clear — a filtered lager, a West Coast IPA, a standard pale ale — is one of the most common finishing problems in homebrewing, and the cause determines whether it clears on its …

A thin, watery, over-dry beer that lacks mouthfeel and body despite adequate OG and ABV is a mash temperature problem in the overwhelming majority of cases — specifically a mash that was too cold for too long, favoring beta-amylase activity …

Flat beer after bottle conditioning is one of the most deflating results in homebrewing — you wait three weeks, chill a bottle, open it, and pour a flat, lifeless liquid with zero carbonation.

Poor head retention is one of the most visible beer quality problems — a beer that pours with foam that disappears within 30 seconds rather than lasting through the glass signals a specific set of fixable problems.

Baby vomit, rancid butter, or putrid dairy in beer is butyric acid — one of the most offensive off-flavors a homebrewer can produce and one with a very specific set of causes that are distinct from other fermentation problems.

Vinegar in beer means acetic acid, and acetic acid in beer means one thing: Acetobacter contamination combined with oxygen exposure.

Soapy flavor in beer — the slick, almost detergent-like taste that coats the palate — is one of the less commonly discussed off-flavors but genuinely unpleasant when it appears.

Skunky beer is the most instantly recognizable off-flavor to anyone who has smelled a skunk or an old green bottle of Heineken left on a sunny bar counter — the sulfurous, mercaptan-based stench is unmistakable.

Cooked corn, creamed corn, or canned vegetable aroma in beer is dimethyl sulfide — DMS — and it’s the off-flavor most directly controlled by boil technique.