Brookshaw, George / A new treatise on flower painting, or, Every lady her own drawing master: containing familiar and easy instructions for acquiring a perfect knowledge of drawing flowers with accuracy and taste: Also complete directions for producing the various tints.
Green Tints, p. 22
22 Green Tints. There are a greater variety of green tints than any other, on account of their being made or composed of a greater number of other colours; but all pea greens, apple greens, and grass greens, are made by mixing gamboge and Prussian blue together; the darker greens are made with sap green, sap green and yellow oker, and sap green, Prussian blue, and yellow oker. In order to make No. 1, of the green tints, take two clean pencils, and a little blue out of your pot with one, and a little yellow with the other; (observe never to dip a pencil into any one of the colours that has got any other colour on it; by doing that, you will run a hazard of spoiling all the colour in that gallipot or dish:) mix the blue and yellow together in a distinct part of the pallet, and you will find it to produce a green; compare it with No. 1, and if it appears too blue, take more yellow. Blue is so powerful a colour, that the least you can possibly take, will be sufficient for six times the quantity of yellow; therefore, when you have mixed the blue and yellow together, you will, from the experiments already made in mixing the blue, pink, and, purple tints, be at no loss to alter the green to make them all so, particularly if you refer to the tints themselves. Observations. In painting a green leaf, you must always begin with the lightest tint, then the first degree of shade, next the second, and heighten
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