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If eaten, the tartaric acid in grapes or raisins may cause acute kidney disease.

In one case, he said, criminals used a fake permit to import 40 tons of tartaric acid.

A transparency tab lists ingredients — organic grapes, sulfites, cream of tartar, tartaric acid, yeast, yeast nutrients and organic cane sugar for sparkling wine.

Chemically speaking, this powder is potassium bitartrate, a salt of mild tartaric acid, with a whole range of useful kitchen applications, from stabilizing beaten egg whites to keeping caramels smooth and chewy.

Industrial winemakers today can simply take care of any potential problems in the cellar, adding products like Mega Purple, powdered tannin or tartaric acid to solve issues of color, structure or acidity.