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Gelatine Wafers

Dissolve fine glue or isinglass in water, SO that the solution, or isinglass in water, so that the solution, when cold, may be consistent. Pour it hot on a plate of glass (previously warmed with steam and slightly greased), fitted in a metal- not turned black by being put into water imlic frame whose edges are just as high as the pregnated with sulphuretted hydrogen gas, wafers should be thick. Lay on the surface a nor does it tinge spirit of hartshorn blue. second glass plate, also hot and greased, so as The infusion is amber-colored, and is not to touch every point of the gelatine while reddened by adding a few drops of oil of vitriol resting on the edges of the frame. By its to it. pressure the thin cake is rendered uniform. 4375. To Detect Copper in Liquids. When the glass plates have cooled, the gela- Spirit of hartshorn turns them blue. Theretine will be solid, and may be removed. It is fore tea has not been dried on copper if an cut into discs of different sizes by means of infusion of it is not turned blue by this mixproper punches.