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Thallium Orange

is produced when bichromate of potash is added to a neutral salt of the
protoxide of thallium, as an orange-yellow precipitate. The scarcity of
the metal precludes their present introduction as pigments, but if the
chromates of thallium were found to resist the action of light and air,
and not to become green by deoxidation of the chromic acid, they might
possibly prove fitted for the palette. It is a question whether their

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