… opacifiers and prepared colours, vitrifiable enamels and glazes, engobes (slips), liquid lustres and similar preparations, of a kind used in the ceramic, enamelling or glass industry; glass frit and other glass, in the form of …
Explanatory notes
… opacifiers and prepared colours, vitrifiable enamels and glazes, engobes (slips), liquid lustres and similar … sometimes sintered to form discs, plates, tubes, etc. for laboratory use. Vitrite is generally used for … electrical parts (e.g., contact terminals for electric lamp caps). Other varieties of powdered glass are used …