Hydrogen sulfide

(This article is in progress)

Hydrogen sulfide (H₂S), or "sulfide" is a yeast-derived off flavor, one of several volatile sulfite compounds. Sulfide aroma and flavor is often described as sulfurous like rotten eggs, "rhino farts", burnt match, or simply "sulfur".

This is one of the most common off flavors that presents in cider and wine. It can also occur in beer and other fermented beverages. In fact, a slight note of sulfide may be acceptable in some styles of lager (beer).

Mercaptans, disulfides, and other badness. ???

Why is it produced?

Lack of nutrients

Others stressors

How do we prevent it?

Nutrients

Racking

How do we get rid of it when it occurs?

Copper

Ascorbic acid

Aeration? / Aging?