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Schmelze.


Glass.) A composition of silica, 500; minium, 800; niter, 100; potash, 100.

To 500 parts of which add: —

43 parts prismatic borax; 4 parts oxide tin; 4 parts oxide antimony; and a small portion of solution of gold in aqua regia. Heat for 12 hours in a crucible and anneal. The mixture is used for making a ruby glass for flashing colorless articles. See flashing.

Folding school-desk.

[2053]

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