Home › Brandy, Whiskey and Imitation Spirits › Tests for Pure Glycerine (Evaporation in a porcelain)

Tests for Pure Glycerine (Evaporation in a porcelain)

evaporation in a porcelain dish, leaves only a slight carbonaceous crust, while the impure has a much greater percentage of coaly matter. The pure article does not become brown when treated, drop by drop, with concentrated sulphuric acid, even after several hours; the impure is discolored even when but slightly adulterated. Nitrate of silver and pure nitric acid turn impure glycerine milky, but do not affect the pure article. Sometimes impure glycerine is blackened by sulphide of ammonium; oxalate of ammonium has a similar effect; lime-water produces a milky cloudiness. Pure glycerine is unaltered by these tests, and when rubbed between the fingers has no fatty smell.

PART VII.

GIVING A DESCRIPTION OF PURE WINE AND ITS CONSTITUENTS, WITH A TABLE OF THE ALCOHOLIC STRENGTH OF DIFFERENT KINDS OF WINE AC- CORDING TO DR. BENCE JONES; ALSO, THE METHOD OF MANUFACTURING