How to make frit

Frit, in the glass manufacture, is the matter or ingredients of which glass is to be made, when they have been calcined or baked in a furnace. There are three kinds of frit: the first, crystal frit, or that for crystal or clear glass, is made with salt of pulverine and sand. The second and ordinary frit is made of the bare ashes of the pulverine or barilla, without extracting the salt from them. This makes the ordinary white or crystal-glass. The third is frit for green glasses, made of common ashes, without any preparation. This last frit will require 10 or 12 hours' baking. The materials in each are to be finely powdered, washed and searced; then equally mixed, and frequently stirred together in the melting-pot.

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