配方类型：	INKS AND MARKING COMPOUNDS
配方说明：	Permanent Porcelain Marking Ink
配方组成：	Glycerin/5 or 6 drops Litharge/2 g. Potassium Carbonate/1 g. Cobalt Nitrate Crystals/2 g. Borax/1 g.
配制方法：	Dry the cobalt nitrate at 100C. for 1 hour. Grind together the first four ingredients. Add the glycerin dropwise until the ink is of a suitable consistency to flow from a pen. Using this ink, the desired markings are written lightly on the ceramic ware, which is then heated to redness for a minute or two over an oxidizing flame. On cooling, this gives a clear, permanent blue mark on the porcelain surface.

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