The so-called ""wrinkling"" of the paint can occur in thick layers with certain colours, especially cobalt, madder and earth colours. The cause lies in the type of pigment and the resulting composition of the paint. This wrinkling can be prevented by mixing the paint with Painting Paste (096), also called ""painter's butter"". A mixing ratio of 1:1 is sufficient. The colour and consistency of the paint remain the same, but oxygen now has easier access to the paint inside.