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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S M A L T.

Smalt is made from glafs ground to a powder, and
coloured with zaffer ; or prepared from fluxing to
the proportion of glafs, one feventh part of zaffer. or
more or lefs according to the degree of deepnefs re-
quired. It will not work with either brufh or pen-
cil, but by ftrewing it upon anv ground of oil-paint
while wet, it makes a bright blue fhining furface,
proper for large fun-dials, and other fuch appli-
cations. In enamel-painting, and in painting on
glafs, it is of great ufe.

BICE.

At prefent feveral compofitions of indigo and ver-
diter with chalk, and other cheap fubftances, are
fold in this name; but the true kind is fmalt, redu-
ced to a fine powder by levigation. From its unfuit-
able texture, it is now greatly difufed, or it makes a
light warm blue colour, and was formerly ufed in
oil, but more frequently in water-colours.

LITM U S or L AT M U S.

Water painting is the only kind in which this can
be uled, and as it is brought from Holland at a very
cheap rate,'it were almoit needlefs to give the pre-
paration. But if any are defirous, for curiofitv, to
know the procefs, it is formed from archal, a fpecies
of mofs, biought from the Canary and Cape de Verd
Iflands, and prepared as follows. '• Add quick lime
'; and putrined urine, or fpirit of urine diftilled from

'; lime
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