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Tests for the Purity of Tin

strength of the acids employed. The plates, It is almost entirely dissolved by hydrochloric after the application of the acids, are plunged acid, yielding a colorless solution of muriate into water, slightly acidulated, dried, and (chloride) of tin. If it contains arsenic , covered with white or colored varnishes. The brownish-black flocks will be separated durfollowing are some of the acid mixtures used: ing the solution, and arseniuretted hydrogen nitro-muriatic acid, in different degrees of dievolved. The presence of other metals in tin lution; sulphuric acid, with 5 parts of water, may be detected by treating the muriate of 1 part of sulphuric acid, 2 of muriatic acid, tin solution with nitric acid, specific gravity and 8 of water; a strong solution of nitric 1.13, first in the cold, and afterwards with acid; 1 part nitric acid, 2 sulphuric, and 18 heat, until all the tin is precipitated in an of water. A solution of potash is also used. insoluble peroxide; the decanted acid solution from pure tin leaves no residuum on ance may be given to sheet tin by a wash of