Fact No. 303. (Published on 11/16/2005)

Striking

Some glass is formulated such that the color changes dramatically upon reheating (the first heating occuring during its manufacture). This color change is called striking.

Often clear or lightly tinted prior to striking, the glass color emerges only after the glass cools after additional heating.

This effect is most common in red and orange glass colored with cadmium. Striking can also occur in glass colored with selenium and gold.

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