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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82 THE ARTIST'S ASSISTANT.

lecling the foot. It mixes well either with oil or
water, and is efteemed as the principal black in all
nicer kinds of painting.

IVORY B L A C K.

" Take plates, chips, or fhavings of ivory ; and
c: foak them in hot linfeed oil ; or, if filings are to
" be more eafily procured, they maybe ufed moiften-
c: ed with the hot oil. Put them into a veffel which
<£ will bear the fire ; covering them with a fort of
£: lid made of clay and fand; which fhould be dried,
c; and the cracks repaired before the veffel be put into
t: the fire. Procure this veffel to be placed in a to-
': bacco-pipe-makers or potter's furnace, or any
<{ other fuch fire ; and let it remain there during one
<s of their heats. When it fhall be taken out, the
" ivory will be burnt properly; and muft be after-
<: wards thoroughly well levigated on the ftone with
<£ water ; or it fhould, indeed, to have it perfectly
<: good, be alfo wafhed over."

It is not fo much ufed as lamp black, owing, per-
haps, to its drying flowly in oil, or to the frequent
adulterations with charcoal duft, which renders it
of a blue caft ; otherwife it is, if genuinelv pre-
pared from the ivory, a full clear black, and ex-
tremely ferviceable.

INDIAN INK.

The true Indian ink is imported from China, and
is of a confiftence, when diflolved with water, ex-
tremely well adapted to the pencil. It is much
uled in miniature painting, and drawings of fmall
kinds. There is a fort frequently fold for it made as
follows :

c; Take
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