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Glass gets its color from metal oxides cooked with the pot metal, and from reheatings. Copper oxide anciently gave turquoise blue, green, or red. Cobalt gave light to deep blue. Manganese gave amethyst to purple, and with iron, orange to brown. Iron gave green, and with copper, forest green. Tin gave milk or opaque white. Silver nitrate, reheated, gave yellow. Iron gave brownish yellow. Gold gave amber, or, reheated, gave ruby red; reheated with tin it gave pink, with manganese, purple. Gold leaf, scattered through the bubble, gave aventurine.

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