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]

Seite: 77
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THE ARTIST'S ASSISTANT- 77

c: Take any quantity of foot of dry wood, but let
'•' it be of beech wherever that can be procured.
c: Put it into wafer in the proportion of two pounds
" to a gallon ; and boil them half an hour. Then,
': after the fluid has flood fome little time to fettle,
" but while yet hot, pour oft the clearer part from
" the earthy fediment at the bottom ; and if, on
(: (landing longer, it form another earthy fediment,
" repeat the fame method : but this fhould be done
'; only while the fluid remains hot. Evaporate then
" the fluid to drynefs, and what remains will be good
<; biftre, if the foot was of a proper kind."

BROWN O K E R.

After procuring this fubftance of fofile earth from
the colourmen. which may he done at a very low
price, care fhould be taken to have it well levigated
and wafhed over; when it may be ufed for a foul
orange colour, and OT3.V OC deoended on for ftand-
ing well.

COLOGN, or COLLIN'; EARTH.

Where the fore ground of a water painting re-
quires to be pretty ftrong, the Cologn earth may be
ufed to advantage. It requires no preparation, fave
grinding perfectly fine with water ; it being of a
fofile fubftance, and a dark blackifh brown colour.

TERRA JAPONICA, or JAPAN EARTH.

A full brown colour is produced from this gummy
fubftance, bv diffolving it with water; but it will
not mix well with oil. It is extracted from fome
kind of vegetable, and its goodnefs may be diftin-
guifhed by the clearnefs of its colour.

UMBR E.
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