A Treatise on Painting
by Leonardo da Vinci, translated by John Francis Rigaud
The Manner of drawing from Relievos, and rendering Paper fit for it
3995517A Treatise on Painting — The Manner of drawing from Relievos, and rendering Paper fit for itJohn Francis RigaudLeonardo da Vinci

Chap. XVI.The Manner of drawing from Relievos, and rendering Paper fit for it.

When you draw from relievos, tinge your paper of some darkish demi-tint. And after you have made your outline, put in the darkest shadows, and, last of all, the principal lights, but sparingly, especially the smaller ones; because those are easily lost to the eye at a very moderate distance[1].

  1. The meaning of this is, that the last touches of light, such as the shining parts (which are always narrow), must be given sparingly. In short, that the drawing must be kept in broad masses as much as possible.