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Dictionary  Rochelle' salt"Chem., Pharm. a colorless or white, water-soluble solid, KNaC4H4O6·4H2O, used in silvering mirrors, in the manufacture of Seidlitz powders and baking powder, and in medicine as a laxative. Also called potassium sodium tartrate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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