or with metal oxides, for example titanium dioxide, iron oxide or chromium oxide, and mixtures thereof.The nacreous pigments may be chosen from white nacreous pigments chosen from mica coated with titanium or with bismuth oxychloride, colored nacreous pigments chosen from titanium mica coated with iron oxides, titanium mica coated for examplewith ferric blue or chromium oxide, titanium mica coated