cloth. The superfluous powder may be rubbed off when dry.


181. IN BRONZING IRON

The subject should be heated to a greater degree than the hand can
bear; and German gold, mixed with a small quantity of spirit of wine
varnish, spread over it with a pencil; should the iron be already
polished, you must heat it well and moisten it with a linen rag
dipped in vinegar.


182. BRONZING CASTS OF PLASTER OF PARIS

There is a method of bronzing casts of plaster of Paris analogous to
that which we have above given for bronzing wood, but it is not in
much repute. Such figures may be beautifully varnished by means of
Dr. John's varnish, receipt No. 178. Casts of plaster of Paris may be
made by receipt No. 167.


183. SHELL-LAC VARNISH

Dissolve in an iron kettle, one part of pearl-ash in about 8 parts
of water; add one part of shell-lac, and heat the whole to
ebullition. When the lac is dissolved, cool the solution, and
impregnate it with chlorine, till the lac is all precipitated.
The precipitate is white, but its colour deepens by washing and
consolidation; dissolved in alcohol, lac bleached by the above
process yields a varnish which is as free from colour as any copal