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Paint and Coatings Industry Standards
ISO 4621:1986 ISO 4621:1986 Chrome oxide green pigments -- Specifications and methods of test
Specifies three grades, which shall not be in admixture with other colouring matter of organic or inorganic nature and shall be free from extenders. The pigment consists essentially of chromium(III) oxide (Cr2O3) in the form of a dry powder.