its softened state; when dry the impression will be sunk into the
horn, and this will serve as a mould to reproduce, either by plaster
of Paris, putty and glue, or isinglass and ground egg shells, the
exact resemblance of the coin or medal.


168. TO CASE FIGURES IN IMITATION OF IVORY

Make isinglass and strong brandy into a paste, with powder of egg
shells, very finely ground; you may give it what colour you please,
but cast it warm into your mould, which you previously oil over;
leave the figure in the mould till dry, and you will find, on taking
it out, that it bears a very strong resemblance to ivory.


169. TRUE GOLD POWDER

Put some gold leaf, with a little honey or thick gum water,
(whenever I speak of gum I mean gum arabic,) into an earthen mortar,
and pound the mixture till the gold is reduced to very small
particles; then wash out the honey or gum repeatedly with warm
water, and the gold will be left behind in a state of powder, which,
when dried, is fit for use.


170. TRUE GOLD POWDER

Another, and perhaps better method of preparing gold powder is to
heat a prepared amalgam of gold in a clean open crucible, (an
amalgam of any metal is formed by a mixture of quicksilver with