Coloured pigments for artist and wall paints made on the basis of a dedicated method. The colorants (reseda, madder, indigo, cochineal, leaf green, catechu, logwood, etc.) are extracted with water adding alum. The pigment is then precipitated as alumina coloured lacquer with lyes, filtered and washed. A laborious process which provides harmonically bright colour shades which sometimes take many days to develop.