| http://www.w3.org/ns/prov#value | - Such inorganic oxides as TiO2, Al2 O3, and SiO2 may be cited as white materials, Cd--Se type oxides as red materials, Ti--Ba--Ni type oxides as yellow materials, Co--Al type oxides as blue materials, Ti--Zn--Ni--Co type oxides as green materials, and Cu--Fe--Mn type oxides as black materials.
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