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If you want to cast gold, silver, copper or
latten, it is necessary that they be perfectly red, &
inflammed on the inside when you cast, & perfectly reheated two
times, if there is something inside to be burnt & cleaned.

The molds of animals that one burns must be reheated in
such a way that the animal burns. But if it has big bones, it is
troublesome to pull out & ☿ often breaks
some fine things by its weightiness. One does not put
☿in molds that can open. This readily
happens with flowers, the mold of these does not open because
they are made all in one go.

When you want to reheat your molds, put the clamps
on the joints, in order that, when reheating, they do not bend,
contract, or break. This is done after the gate is made.

The scrapings of the mold can still be used, using them in
place of brick, after having reheated them, & also the
pieces of the molds that have been used. One lutes with it
also important things, like works of gold or silver. One
also reheats it, & prepares it with sewater
of sal ammoniac, as spat from Germany, & it is
excellent sand for frames for all metals.

The molds of things where one needs to burn them inside, do
souf not open until the things which are inside are
burnt, like with molds of crayfish, crabs,
stag beetles, representations & pieces of sulphured
black wax, which do not release well.

One ought not to mold on brick or wood because they
l’ea drink & attract water too soon, and
do not allow the sand to set. It would never be better than on a
fresh clay slab. Yet, I have experienced that grey
earth dries the mold too soon. The yellow is
better.


For medals, and flat things, it is necessary that the sand be thick
enough, wet, because it sets quickly. And when the sand is thusly thick,
one can hit and shake the table where the mold is
placed, to make it run everywhere. But when the sand is thin, like for
flowers and plants, one ought not to hit, nor when there is something
attached with wax or another thing that is subject to coming off,
like crayfish legs or similar things. And if the sand is, by
chance, too thick, you quickly put in it some
pourwater. Having put the sand in
water, it examine that it is thick at the bottom &
thin on top. The thinnest is cast at the beginning and then becomes
porous & the thickest at the end in order to fortify the
mold.

