омг. Артемка Лебедев плачет кровью, смотря на сайт по ссылке. А вот что тут нашел про пигменты:
13. Once all pigments applied, small drops of White Spirit were applied over the entire model. The idea is apply drops over the pigments and not brush the white spirit over the pigments. This would ruin all the pigments work.
Applying drops will act as capillarity and will fix the pigments in place. While we are applying the drops it seems that we are ruining all the previous work. The pigments will turn very dark and with a strange look, but when the white spirit is fully evaporated, the pigments will appear in full color. Just let the white spirit evaporate and do not touch it until is wet.