only dissolve with great difficulty or hardly at all in water or solvents and need to be intensively worked into the binding solvent (ball mill, bead mill, sand mill or triple roller). For transparent and opaque materials:
Earthy colours: Chalk, gypsum, talc, quartz.
Mineral colours: Titanium oxide, zinc oxide, lithopone, iron oxide colours yellow, brown, red, black.
Coloured pigments: Compounds of chrome, cadmium and manganese