SALMON, William, Polygraphice, Or The Art of Drawing, Engraving, Etching, Limning, Painting, Washing, Varnishing, Colouring and Dying. In three Books. I. Shews the Drawing of Men, and other Animal Creatures, Landskips, Countries, and Figures of Various Forms. II. The way of Engraving, Etching and Limning, with all their Requisits and Ornaments. III. The way of Painting, Washing, Varnishing, Colouring, and Dying, according to the Method of the best Authors now Extant. Exemplified in the Painting of the Antients, Washing of Maps, Globes, or Pictures ; Dying of Cloth, Silks, Bones, Wood, Glass, Stones and Metals : together with the way of Varnishing thereof according to any Purpose or Intent. The Like never yet Extant. By W. S. a Lover of Art, London, E.T. and R.H., 1672.1 quotations
IV. Having made your hand fit and ready in General proportions, then learn to give every object its due shade according to its convexity or concavity, and to elevate or depress the same, as the object appears either nearer or farther off the light, the which is indeed the life of the work.
A piece of Silk, or Cloth hung, or laid flat, has not the Beauty tho’ the Colour of it be pleasing, as when flung into Folds ; nay a piece of Silk that has little Beauty in it self shall be much improv’d only by being Pink’d, Water’d, or Quilted ; the Reason is, in these Cases there arises a Variety produced by Lights, Shades, and Reflections.
There are, as I said, certain Colours less agreeable than others, as a Brick-Wall, for example, yet when the Sun strikes upon one part of it, and the Sky tinges another part of it, and Shadows and Reflections the rest, this Variety shall give even That a Degree of Beauty.