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Ammonium dichromate is the inorganic compound with the formula (NH4)2Cr2O7.
A 2117 (OTTO) Ammonium dichromate, GR 99%+ Cas 7789-09-5 - used in photo engraving, dye mordant, pigments, pickling, photography, process engraving, lithography, pyrotechnics, glazes for porcelain and china wares.