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Aldehyde. — On warming 10 cc. of alcohol with 5 drops of silver nitrate solution and 1 cc. of water for ten minutes on the water-bath (70 to 80° C ) , neither a turbidity nor a precipitate should form. f — The red color of a mixture of 10 cc. of alcohol and 1 drop of a 1:1000 potassium permanganate solution should not pass into yellow within twenty minutes. Metals and Tannin. — On adding to 10 cc. of alcohol 1 cc. of ammonia water or 5 cc. of hydrogen sulphide water, no coloration should develop.

On mixing 10 cc. of an aqueous (1:5) solution of tannie acid with 10 cc. of X5 per cent, alcohol, the mixture must remain clear for one hour; nor should a turbidity occur on the further addition of f> cc. of other. CHEMICAL REAGENTS 43 Water. — On drying tannic acid at 100° C , it should not lose more than 12 per cent of its weight. NOTE. — Regarding the quantitative determination of tannic acid, see Fresenius, Anleitung zur quantitativen Analyse, Vol. -tech. , 3, 560 ff. (1900)]; Fresenius-Cohn Quantitative Analysis, Vol.

Wt. 2. A white, very bulky, hygroscopic powder,* used for Wislicenus' f determination of tannin. Under a microscope, magnifying about 30 to 60 diameters, the powder appears in the form of partly transparent, flocculent masses, resembling vegetable tissue. TESTS OF PURITY Metallic Mercury and Aluminum. — On moistening the preparation with water or alcohol, it acquires a gray color if any aluminum or mercury is present; if pure, it remains perfectly white. No globules of mercury or particles of metallic aluminum should be visible under the microscope.

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