| http://www.w3.org/ns/prov#value | - The first crystalline or semicrystalline material of said first additional solid particles may be a mineral material that may be chosen from silica, glass, diamond, copper, boron nitride, ceramics, metal oxides, especially iron oxides, for instance black iron oxide, red iron oxide or yellow iron oxide, titanium oxides and alumina, and mixtures thereof.
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