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Glass of Borax

Calcine borax with a strong heat till the water of crystallization is expelled, and the salt fuses into a clear glass.

Enamels.

A. species of vitreous varnish, colored by means of metallic oxides (see No. 2393) and applied in a thin stratum to brightly polished metallic surfaces 2373. To Make Prince Rupert's Drops. Prince Rupert's drops are made by letting drops of melted glass fall into cold water; the drops assume by that means an oval form, with a tail or neck resembling a retort. (copper or gold), on which it is fused by the They possess this singular property, that if a flame of a blowpipe, or by the heat of a small small portion of the tail is broken off, the furnace. The basis of all enamels is a highly whole bursts into powder, with an explosion, transparent and fusible glass, called frit, flux, and a considerable shock is communicated to or paste. the hand that grasps it.