Thallium Red





The orange-yellow precipitate formed by mixing a neutral salt of

protoxide of thallium with bichromate of potash, is converted by nitric

acid into an orange-red. The latter compound, which is a terchromate, is

almost insoluble in cold water, 2814 parts being required to dissolve

it. If the colour be boiled in a large excess of moderately strong

nitric acid it is dissolved, yielding magnificent cinnabar red crystals

on the solution cooling. These crystals likewise seem to be the

terchromate.





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