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Calcium dichromate (CaCrO4) is a chemical compound of the alkaline earth metals calcium and chromium. It is a solid, yellow, non-hygroscopic substance, and is also known as chromatite. When heated, it decomposes to a calcium oxide, which is a corrosion inhibitor. This is the primary use of the compound, but it is occasionally used in the pigment industry.
Calcium dichromate is usually found in dihydrate form CaCrO4 *2H2O, and can be mixed with sodium or potassium chromate to create a soluble compound. The combination is commonly used as an analytical reagent. However, the use of aqueous solutions is sometimes problematic for staining materials. In some cases, a solid chromate can be burned, and this may present a fire hazard. To minimize the danger, use a dust mask, and gloves. Do not use aqueous solutions on the skin, and be careful not to swallow or inhale the solution.
Calcium dichromate is used in the analysis of aqueous solutions of certain chemicals, and in the reduction of other compounds. Generally, it is available in its most common form, though a high purity product can be available in a nanopowder or submicron form. Regardless of the quantity you require, you should always confirm the purity, identity, and origin of the product before purchasing.
CaCrO4 is toxic to humans, and should be handled with care. If absorbed through the skin, it can cause dermatitis. For this reason, it should be stored in a closed container and disposed of in a safe way.