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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.

My kitchen includes a bunch of chemicals that aren’t kept under the sink or handled only with gloves, including sodium bicarbonate, acetic acid, potassium bitartrate, lecithin, pectin, and ascorbic acid.

I have found bitartrate of potassium the most grateful and efficient saline for depurative action.

Cream′-wove, woven of a cream-colour; Cream′y, full of or like cream: gathering like cream.—Cream of tartar, a white crystalline compound made by purifying argol, bitartrate of potash.

It is decomposed by a hot solution of potassium bitartrate.