prov:value
| - Suitable metal oxides of high refractive index are, for example, titanium dioxide, zirconium oxide, zinc oxide, ceriumoxide, iron oxides (Fe.sub.2 O.sub.3 or Fe.sub.3 O.sub.4), iron/titanium oxides (iron titanates) and/or chromium oxide, BiOCl, FeO(OH), spinels, titanates, aluminates, chromates, tungsten bronzes, tin oxides (also doped), or nitrides, for example TiN, inparticular TiO.sub.2 and/or
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