FIELD: building materials production. SUBSTANCE: charge to produce black pigment has chromium oxide, nickel oxide, and chromium with stoichiometry needed to produce chromium/nickel spinel. Interaction of components follows reaction: CrO3+Cr+NiO = NiCr2O4+Q. Pigment characteristics: maintain color stability at temperature of annealing up to 1600 C 99.2 per cent stability to HCl, 99.9 per cent water resistance. EFFECT: temperature stability, acid stability, water resistance.
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