150r - - - - - Very strong wax
Mix with this some resin and bole. Do not cast very hot.
Diverse ligues of tin and lead
For hollow things like turtles, half refined lead and half tin.
For flowers, almost all lead, that is to say, a lb of refined tin, and two ℥ of refined lead.
For lizards that are as thick as one or two fingers, almost all lead, that is to say, a lb of refined lead and 4 ℥ of refined tin.
Moulds
They are less prone to cracking while reheating when they are very thick, rather than thin, provided that thickness is sufficient. Because when they are thin, they do not need to be fired for long, and prolonged exposure to heat corrupts them. The same thing will happen if you plaster is not strong.
It is better to reheat one mold on its own, rather than heating it with others, because should this be the case, you will need a stronger and hotter fire, than for just the one mold. And because charcoal will accumulate between multiple molds, the heat will transfer from mold to mold in such a way that you will often find that your molds have burst and crack on one side more than the other.
Therefore reheat your molds, not applying fire, except to cover it.
And because your lead and tin become brittle when melting the over high heat, in order to make them less brittle, heat them over low heat, and cast in stick form.
Brick cools the metal, and if this is not for binding, it is not necessary.
at left middle margin
The reheated moulds cannot withstand several casts, but the ones in which you only cast tin or lead and flat medals, these being dry, withstand a lot of casts.
at left middle margin
Iron filings being finely ground, makes them molds very firm and strong.
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