The Principles of Colouring in Painting. E-book. Formato PDF Charles Martel   -  Forgotten Books, 2017  - 

It is not meant that the natural appearance of the coloured materials is altered; but, that owing to the eye being constructed for seeing white light, it passes through certain successive stages, which cause the colours looked at to appear changed. From this fact the painter learns, that to imitate his model faithfully he must copy it differently from what it appears to him.