| http://www.w3.org/ns/prov#value | - , from titanium oxides, especially TiO2, iron oxides, especially Fe2O3, tin oxide, chromium oxide, barium sulfate and the following compounds: MgF2, CrF3, ZnS, ZnSe, SiO2, Al2O3, MgO, Y2O3, SeO3, SiO, HfO2, ZrO2, CeO2, Nb2O5, Ta2O5, MoS2 and mixtures or alloys thereof.Examples of such particles that may be mentioned include particles comprising a synthetic mica substrate coated with titanium dioxi
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