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Main.PIGMENT.Light Interference Pigments.Co.: DE. B (Substrate: Al2O3).Patent.Claims Etc.Claim 1: Optically Variable Pigment.Treated with Slurry Water, Organic.Solvent & Metal salt Select:.Salts of Transition Metals having.Atomic Numbers 21-28; 39-42; 57 &.72-74; & Salts of Lanthanide Series.of Rare Earth Metals having Atomic.numbers of from 58 to 71. Claim 2:.Vanadium Salts Etc. Claims 3,4:.V Salt (1-30%) Protect Pigment Surf.ace from Corrosion in an Aqueous.Environment having a Basic pH..Patent Assignee |