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terminology

Coloured glass

Glass that is colored by (1) impurities in the basic ingredients in the batch or (2) techniques of coloring glass by one of three main processes:
A. using a dissolved metallic oxide to impart a color throughout;
B. forming a dispersion of some substance in a colloidal state;
C. suspending particles of pigments to form opaque colors.

source Corning Museum of Glass

related terms

Colourmelting
Colourrods
Reduced flashed glass

dutch term

Gekleurd glas