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Double Soluble Glass

A mixture of 3 parts by measure of concentrated potash soluble glass, and 2 parts concentrated soda glass, produce a double water-glass which will answer all practical purposes. ation is also recom- The following preparation is also recommended by Fuchs, as being much easier to fuse. Take 100 parts quartz, 28 parts purified potash, 22 parts neutral dry carbonate of soda, and 6 parts powdered charcoal. the open air, for fire invariably injures the colors. (Sce Nos. 2837, etc.)