Hydrogen sulfide

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Hydrogen Sulfide

H2S for short, Hydrogen sulfide is produced in all beer and wines by yeast combining with various forms of sulfur, but in excess creates an undesirable, rotten-egg-like smell in wine. If not corrected, the wine is ruined as the gas is transformed into mercaptans, with a skunky odor, and then disulfides, with a sewage smell.