What is that stuff sometimes found at the bottom of the bottle?
A. It could be one of two things; • Tartaric acid crystals: a harmless malady that forms after the bottle has not been properly stored. or, • Black tannic deposits: a deposit of tannin and other colored materials that form after years of aging. Affects mostly red wines, and is not a sign of bad wine. There are other maladies that can affect wine’s quality, but they are very rare.
