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.
Purples, pp. 20-21
21 comparing the purple, you have already mixed with the various tints, you will see which of them it is most like; and by adding either more lake or more blue, you may vary the tint to any one of your patterns. To make the lighter tints, add more water, as in making the light blues and pinks, and by repeated trials you will find out every one of the purple tints. There are some very deep rich purples, which are extremely difficult to imitate; such as the large iris or flag-flower, the heart's-ease, some of the major convolvoluses, auriculas, and many others; in such cases, therefore, you must have recourse to art to obtain the effect as nearly as possible. The best method is to lay in the deep velvet purples first, with deep blue alone, as strong and dark as you can; then glaze the blue over with lake; when it is dry, you may give it a still richer look, by glazing it a second time over with lake. Another method is, by laying the colour in with deep purple, and then glaze it over with lake; but most dark purple flowers have parts where the light comes upon them, that look of a deep rich pink or crimson tint; therefore wherever that tint appears, care must be taken never to cover those parts with blue or- purple, but do them with deep lake. For further directions see the tints. G
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