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Potassio-Tartrate of Soda

Known in commerce as Seignette's or Rochelle salt. Dissolve 12 ounces carbonate of soda in 2 quarts boiling water; add gradually 16 ounces bitartrate of potassa in fine powder.

Strain, evaporate to a pellicle or crust (see No. 9), and set it aside to crystallize. The mother liquor may be further evaporated for a second supply of crystals. (Cooley.) The U. S.

Pharmacopœia adopts the same method, but directs 5 pints of boiling water to be used.

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