Powder painting
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Powder painting, also called Frit painting, is the art of using ground glass in powdered form to create kilnformed glass art. The process differs from enameling in many respects. Firstly, the powder is actually ground glass typically from a single manufacturer who supplies an extensive color palette. Large jars can be purchased which are fairly inexpensive compared to enamels, making large scale paintings possible.
This technique is one variation of many ways to create images on glass using glass bits (frits), and in this case powder.[1]
The process is fairly simple whereby the dry powders are arranged on sheet glass in any desired pattern or design. The glass is then fired in a kiln only to the point of making the powder stick to the glass, leaving the powder in what appears to be a soft powdery form as opposed fully fusing the powders into the glass.