Devitrification

09/23/09 – Devitrification – Devitrification can sometime occur on glass that has been fired and held at a high temperature. A crystalline substance appears as a dull finish on the surface of some glass when heated above 1000° Fahrenheit and held for an extended period of time. This is a white scum that will appear on the glass. Normally this is an undesired occurrence, but some artists actually try to achieve this look on their pieces.

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