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Enamel is coloured glass, crushed to a fine, sand-like
consistency. It is then fused onto a metal surface (gold,
silver, copper, or steel) at temperatures of around
800°C. Enamels may be transparent or opaque.
It is often used on steel for practical purposes, such
as baths, cookers and architectural cladding. On precious
metals it is used for its decorative qualities, most
notably its brilliance and colour.
Several different techniques of applying the enamel
have evolved over the centuries, each with their own
distinct qualities. The art of enamelling has a long
history, with some evidence of enamelled jewellery having
been made as far back as the sixth century BC.