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Bichromate of Potassa

The red chromate of potash is obtained from a concentrated solution of the yellow chromate, by adding sulphuric (or, still better, acetic) acid in quantity equal to half that required for the neutralization of the salt. (See No. 83.) The liquid is then concentrated by evaporation, and slowly cooled, so that crystals may form. 4188. Substitute for Bichromate of Potassa. One of the German scientific jour-