101v - - - - - [continued]
the crucible is red. Next, throw it on marble, and you will have a substance white, hard & even, like alabaster, with which you will be able to cast medals which will resemble marble, but keep them out of the humidity.
Jacinth
Is made like ruby, with gold; but one does not need such a great fire. The ruby wants fire for a whole day, and if it does not have enough fire, it will only have red veins.
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Always heat up your crucibles.
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One holds that rubified antimony makes jacinth.
Topaz
I melted one part of calcinated & pulverized pumice stone & tr with three parts of minium, the stone having been pulverized in a steel mortar. A very beautiful yellow came to me, without any grain more yellow than the others. It is true that it was strongly charged with colour. I believe it would be better to pulverize the pumice in a glass mortar, because it & the minium make enough yellow by themselves. A mass came to me, the top of which was the beautiful yellow, as mentioned, and the bottom was like a fire—stone without transparency. With which, in mixing other
Varnish
The Germans make minium boil a lot in linseed oil, & to give it the body of varnish, they mix in very pulverized yellow amber.
Gum ammoniac
One puts it by small pieces into a little good vinegar, & one heats, then one passes it through a cloth strainer. All medicinal gums dissolve in vinegar.