Potassium-dichromate meaning

A bright yellowish-red crystalline compound, K2 Cr2 O7 , used as an oxidizing agent, and in pyrotechnics, explosives, and safety matches.
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A yellowish-red, crystalline compound, K2Cr2O7, used as an oxidizing agent and in photography, dyeing, etc.
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(chemistry) A potassium salt of chromic acid, K2Cr2O7; the orange crystals are soluble in water, and it is used as an oxidizing agent and in photography.
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