| http://www.w3.org/ns/prov#value | - Such additives may be talc, kaolin, barium sulfate or the like, but preferably aluminum silicate, surface-treated aluminum silicate, titanium dioxide, calcium carbonate, antimony trioxide, barium titanate, calcium titanate, strontium titanate, magnesium oxide, calcium silicate, zinc oxide or the like, especially colloidal silica and surface-treated hydrophobicsilica.
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