Question

what is purple of Cassius. how it is prepared​

Answer 1

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»Purple of Cassius is a purple pigment formed by the reaction of gold salts with tin It has been used to impart glass with a red coloration (see cranberry glass)

»Preparation:- It is prepared by mixing very dilute solution of gold chloride with stannous chloride solution. The gold thus precipitated is adsorbed by stannic hydroxide formed by the hydrolysis of SnCl4

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