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])

190 THE ARTIST'S ASSISTANT.

berries, prepared as in p. 67. but a much more beau-
tiful colour may be obtained by ufmg the tinfture of
turmeric formed by infufing an ounce or more of the
root, powdered, in a pint of fpirit of wine. This
may be made to give any teint of yellow, from the
lighteft ftraw to the full colour, called French yel-
low ; and will be equal in brightnefs even to the
beft dyed filks. If yellow be wanted of a warmer
or redder call, annatto, or dragon's blood, muft be
added to the tinfture.

The beft manner of ufmg thefe, and the following
tinftures. is to fpread them even on the paper or
parchment, by means of a broad brufh, in the man-
ncr of varnifiling.

Of flaming paper, or parchment, red. —Paper or
parchment may be ftained red, by treating it in the
fame manner as is directed for wood, p. 182, or by
red ink. It may alfo be ftained of a Icarlet hue by
the tinfture of dragon's blood in fpirit of wine : but
this will not be bright.

A very fine enmion ftain may be given to paper,
by a tinfture of Indian lake ; which may be, by in-
filling the lake fome days in fpirit of wine ; and
then pouring off the tinfture from the dregs.

Of itaining paper, or parchment, green.—Paper, or
parchment, may be ftained green, by the folution of
verdigrile in vinegar: or bv the chryftals of verdi-
grife diffolved in water. As alfo by the folution or
copper in aquafortis made by adding filings or cop
per gradually to the aquafortis till no ebullition en-
uies; or fpirit of fait may be ufed in the place of the
aquafortis.

Ol itaining paper, or parchment, blue.—A blue
colour may be given to paper, or parchment, by

ftaining
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