DEEPEN (TO) (v.)
PEACHAM, Henry, The Compleat Gentleman: Fashioning Him absolute in the most Necessary and Commendable Qualities, concerning Mind, or Body, that may be required in a Person of Honor. To which is added the Gentlemans Exercise or, An exquisite practise, as well for drawing all manner of Beasts, as for making Colours, to be used in Painting, Limning, &c. The Third Impression much inlarged, especially in the Art of Blazonry, by a very good Hand, London, E. Tyler, 1661.2 quotations
Having made your hand fit and ready in generall proportion, learn to give all bodies their true shadows according to their eminence and concavity, and to heighthen or deepen, as your body appeareth nearer or farther from the light ; which is a matter of great judgment, and indeed the soul (as I may say) of a picture.
After you have made the white of the Eyes, and proportion of the Nose, &c. lay your Carnation or Flesh colour over the Face, casting in here and there some shadowes, which work in with the flesh colour by degrees. Your flesh-colour is commonly compounded of white lead, lake, and vermilion ; but you may heighthen or deepen it at your pleasure.
BROWNE, Alexander, Ars Pictoria : or an Academy Treating of Drawing, Painting, Limning, Etching. To which are Added XXXI. Copper Plates, Expressing the Choicest, Nearest, and Most Exact Grounds and Rules of Symmetry. Collected out of the most Eminent Italian, German, and Netherland Authors. By Alexander Browne, Practitioner in the Art of Limning. The Second Edition, Corrected and Enlarged by the Author, London, Arthur Tooker - William Battersby, 1675.1 quotations
Some further Directions how to temper and mingle your Colours by way of Composition or Temperature, to make all these following Colours, and also the manner how to Deepen or Shadow them.
For Carnatian temper Lake and White, and deepen it or shadow it with Lake.
For a Violet temper fine Dutch Bice and Lake, and deepen it with Indigo.