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]

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as ftone :—Take clean and fine fifted afhes, and fine
plaifcerof Paris, of each an equal quantity, and tem-
per the mixture with gum water, or with fize o
parchment ; knead it well together, andprefs it down
into vour mould ; but do not prepare more than
■what you ufe prefently, elfe it will harden under
your hands-. You may give it what colour you
pleafe ; in mixing it for black, take lamp-black ;
for red, vermillion ; for white, flake white; for
green, verdignfe ; for yellow, Dutch pink, &c.

You may, mftead of gum or fize, ufe the whites
of eggs, which is more binding.

To imprefs figures in imitation of porcelain : —
calcined and fine pulverized egg-fhells, worked
with gum-arabic and the white of eggs into a dough,
then preffed into a mould, and dried in the fun, will
come out fharp, and look fine.


T^RONZING is colouring, by metaline powders,
plaifter, or other bufts and figures, in order to
make them appear as if caft of copper or other

This is fometimes done by means of cement, and
fometimes without, in the inftanceof plaifter figures ;
cut the bronzing is more durable and fecure when a
cement is ufed.

Gold powders, and aurum mofaicum, are fre-
quently employed for this purpofe ; but the proper
bronzing ought to be of a deeper and redder colour,
more relembimg copper ; which effedr. may be pro-
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