Metastannic acid

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Metastannic acid is a real pain for the refiner when it appears, it is a white gelatinous substance made up of hydrated tin oxide, H2SnO3. It is virtually impossible to filter and not easily dissolved. It traps gold flakes within the gel and takes forever to settle when disturbed. The easiest way to form metastannic acid is to dissolve tin containing material in nitric acid.

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