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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