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Fuchs' Soluble Soda Glass

This is prepared in the same way as the potash of powdered quartz, from which a concentrated glass (see No. 2817), with the exception that solution is prepared, 1 part of which is then a smaller proportion of soda is required. A added to 4 parts of a concentrated and fully mixture of 45 parts by weight of quartz, 23 saturated solution of potash-glass solution, by parts dry carbonate of soda, and 3 parts char- which there is a more condensed amount of coal, may be employed. The mixture fuses silica with the alkalies; this solution has somewhat easier than potash glass. been found to work well for paint. Siemens'