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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https://digi.ub.uni-heidelberg.de/diglit/assistent1785/0086
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7* THE ARTIST's ASSISTANT.

TINCTURE of SAFFRON.

It makes a good fhade for gamboge or other light
bright yellows : by pouring hot water on the befh
Englifh faffron in a proper phial or other veffel ;
which fnould be placed for fome time in a heat
next to that which would make water boil; and the
tin£lure fhould then be filtered from the dregs
through a piece of linen cloth.

Z E D O A R Y WASH.

Take an ounce of zedoary-root, and boil it in a
quart of water till the water appear fufficientlv
tinged to a yellow : flrain it through linen and it
will be a ftronger colour than can be made of tur-
meric without fpirits of wine, and is valuable for
many purpofes in painting with water colours, as
flowers, yellow draperies, &o

Class IV.* Of GREEN COLOURS.

V E R D I G R I S E.

Let the pulp of grapes or any fuch acid remain
upon copper; and the ruft formed by its corrohve
a£lion is verdigrile. It is brought from France and
Italy hither, and makes a blue-green colour in paint;
but will not ftand in oil. It fhould have a fmall ad-
mixture of yellow to render it a true green.

CHRYSTALS

* Class IV. GliEE tf.

Verdigrife. Prufiian green.

Diftilled verdigrife, or chryftals Terra verte.

of verdigrile. Sap green.
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