is not the cafe of vitrified lead, they are very ne-
ceffary to be compounded with lead ; or ufed in its
place, affiiled by borax, where abfence of every de-
gree of colour is neceffary in the flux.
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PAINTING upon GLASS.
r I ~*HE antient manner of painting upon ^lafs was
very fimpie, and confequently very eafy; it con-
fifted in the mere arrangement of pieces of glafs of
different colours in fome fort of fymmetry, and
conftituted what it now called Mofaic work.
In procefs of time they came to attempt more re-
gular defigns, and alio to reprefent figures heightened
with all their fhades: Yet they proceeded no farther
than the contours of the figures in black with water-
colours, and hatching the draperies after the fame
manner, on glaffes of the colour of the object they
c'efigned to paint. For the carnation, they ufed glafs
pf a bright red colour ; and upon this they drew the
principal lineaments of the face, &c. with black.
But in time, the tafte for this fort of painting im-
proving confiderably, and the art being found appli-
cable to the adorning of churches, &c. they found
out means of incorporating the colours in the glafs ii-
felf, by heating them in the fire to a proper degree ;
having firft laid on the colours.
The colours ufed in painting or ftaining of glafs,
are very different from thofe ufed in painting either
in water or oil colours.
For black, take fcales of iron, one ounce ; fcales of
copper, one ounce; jet, half an ounce; reduce them