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Glass is a very special material - not a solid, not a liquid.
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The ancient Babylonians and the Egyptians are thoght to be the first to make glass. It is a combination of two materials, silicates and fluxes. Silica is a mineral found in many substances including sand. The flux is vital because the normal melting point of silica is 3000'f - which would be near impossible to work. The flux allows the silica to be worked at a much lower temperature. As with many natural crafts the materials originally used were chosen partly for their suitability and also simply because they were available. For instance, the Romans used soda ash, the English flints and the Germans potash.
For thousands of years glass was
simply moulded into shape by pressing it over a clay or dung mold that
often had a raised pattern on it. The Egyptians were the first to make
pane or flat glass, but it was a diffacult labor intenseive process -
involving moulding a cylinder and then cutting it open, and only small
pieces could be made. but with the invention of glass blowing, working
with glass became a major craft.
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