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For Middle Eastern and European wines, for example, they test for tartaric acid, found in large quantity only in the Eurasian grape, together with other organic acids (lactic, citric, and succinic acid) common to this grape; background amounts produced by microorganisms are also checked.

Grape pips and other remains, if they are preserved and recovered, help confirm the analysis.

Clouds of ethanol and other alcohols billions of kilometers across, by the way, exist in star-forming regions elsewhere at the center of our galaxy, the Milky Way, and throughout the much larger universe) having become extinct around 40,000 years ago.The fermentation of beer from barley, for example, produces calcium oxalate traditionally known as “beerstone,” so that is what the team searches for in residues.Other archaeological criteria must be applied for substantiation, because this compound is widespread in nature—it is, for example, the most common constituent of human kidney stones.Most of us carry the genetic signatures of interbreeding between these species.Humans began making pottery in China from around 18,000 years ago.

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