| http://www.w3.org/ns/prov#value | - As pigments, use may be made of metal oxides, such as iron oxides (in particular yellow, red, brown and black iron oxides), titanium dioxides, cerium oxide, zirconium oxide or chromium oxide; manganese violet, ultramarine blue, Prussian blue, cobalt blue, ferric blue, bismuth oxychloride, mother-of-pearl, mica coated with titanium or w
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