Suitable pigments are inorganic pigments, such as titanium dioxide, chromium oxides and iron oxides, cadmium pigments based on the sulphide and sulphide/selenide, mixed phase pigments of the rutile or spinel type and carbon black pigments, as well as organic pigments of all known classes of pigments, for example copper phthalocyanine pigments, quinacridone pigments, diaryl yellow pigments, dioxazi