The Artist's Assistant, In the Study and Practice of Mechanical Sciences: Calculated for the Improvement of Genius. Illustrated with Copper-Plates — Birmingham, [ca. 1785]

Page: 103
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1 cm

pie are, muft be mixed with a folution of clear gum-
arabic in water, the true ftrength of which you will
know by the colour when dry ; if it rubs off with
the finger, it is too weak ; and if it cracks or fcales
off, it is too ftrong. The colours when firft mixed
with gum water will not work fo free, as if dried and
ground afrefh with common water. Be careful to
fpread each colour fmooth, in order to which, let
your pencil be as large as the fubjecl will admit:
in tranfparent colours lay on the pale firft, to which
give depth by four or five (at mod) gradations;
foftening the harfh diftinclions of teints by faking
off the edge with a clean pencil dipt in water.
With body colours your work will look more pic-
turefque by laying on firft the middle teint ; but with
thefe, and the tranfparent too, let each colour dry
before you apply another. If your colour or pa-
per feem greafy, add a drop or two of gall, and
it will readily adhere. Clean your pencils always,
as they will fpoil by being left in the colour or



HPHIS flower admits of a great variety and difplay
in the drawing ; fome are blue, others purple,
others again are ftriped, crimfon on white or draw
coloured grounds. The green is the common green,
begun with fap green, and finifhed with a mixture
of gumboage and indigo ; making fome parts with
gumboage, a little carmine and green, as fading,

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