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Polishing Substances

The substances used by the worker in gems and precious stones are principally powdered diamond, sapphire, and ruby; for the several operations in the various metals, powdered corundum, emery, pumice-stone, flint, tripoli, rottenstone, chalk, oxide of tin, oxide of iron, etc., are used by metal-workers. For the first operations in glass-polishing, silex sand and water are used between the rubber and the glass, after which different grades of emery, and finally the putty powders, or oxide of tin. See throughout the work for a description of the substances mentioned.