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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THE ARTIST'S ASSISTANT. 75

' fediment. which is the Pruflian green ; and after-
• wards to dry it, in the fame manner as is directed
*' for the blue."

TERRA VERTE.
This is fuppofed to be a native earth, brought
from abroad, of a coarfe texture, requires to be
well levigated afhed over ; but no other pre-

paration is neceffary previous to its ufe.

Class V.* Of PURPLE COLOURS.

The true INDIAN RED.
Perhaps it may be no eafv matter to procure
this colour true ; for it is a native ochrous earth,
very ufeful in oil, in its compounded ftate, as well,
for force in its effect as certainty of ftanding. But
the fictitious kind, now fallacioufly called by its
name has no good property as a purple : in fliort,
it is varied into a broken orange, and rejected by
moft colourmen and painters. The true kind needs
no other preparation than grinding or warning over.

ARCHAL or ORCHAL.

This mav be made in a very eafy manner by thofe
who cannot procure it of the manufacturers ; and
is an extreme bright purple fluid, but apt to dry to
a reddifh brown, and therefore much difufed at
prefent.

" Take an ounce of the archal weed or mofs, as
<: it is fold at the dry-falters ; and having bruifed it
■'; well, put it into a glafs phial with half a pint of

K 2 t; weak

* Class V. P U R P L E.
True Indian red. Archal, or orcbal.
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