Crushed glass is called frit. When it is finely crushed – to a grit size of table salt (or finer) – it is commonly referred to as glass powder.
For the lampworker or glass blower, glass powders can be applied onto the molten glass.
For the kiln-glass artist, the uses for glass powders are limitless. Powders can be sifted onto sheet glass (often with stencils), cast in pate de verre, used for powder wafers and in liquid stringer, and much more.
Different colored glass powders can be mixed to create new colors (though some glass combinations are reactive and typically yield only muddy browns).