092r - - - - - SandMixture easy to melt
One ℥ de part soft tin, one part fine lead, one part looking glass tin & one part argent vif arresté makes an alloy & a solder, so easy to melt that it can easily be melted in a dish of fine tin.
Molding a cavity on one side and in relief on the other
And for this effect, one casts a medal of fine tin, which is harder to melt. And since it is neat, one molds with it. And one leaves it in one half of the frame, & presses it a little so that it holds better. And next, you will cast in your frame some solder described above, or another more meltable than fine tin. And thus, the second medal will melt & mold itself on the first one without spoiling it. But to make sure this is done right, mix some lamp black with water, & with a pinceau, give a light coat of this to the medal, which remains in the frame, & leave to dry. Thus it will not melt.
But if you have a medal of copper or silver, you can leave it in the cast, if you want to cast with lead or tin. But it is necessary that it be a little hot, for the cold would make the tin contract.
Tin wants to be cast quite hot to come out neat.
Soft tin, which is the best for the cast, is the one that, once cast en grille, is burnished & shiny & polished like a mirror, & appears to have been burnished. And has have holes like the one that is brittle, & that is not shiny, as if burnished.
Potin
Potin, once cast hot, runs & flows like tin. But the medal becomes whitish from this, and immediately pushes the verd to the surface, which good substances do not do.
Molding statues
Half founder’s earth, which founders use, & half clay earth, g renders very neatly.