084v - - - - - Sand
I tried the bone of oxen feet, very burned & pulverized & ground on porphyry, until it is not felt between your fingers. It molds on its own very neatly. But because on its own it is very arid & lean, it wants to be well moistened & dampened with wine boiled with elm root.
Iron dross, well burned bone of oxen feet, felt also well burned over a closed fire, and all three very well ground on porphyry mold very neatly in lead, without needing to be reheated a lot, & casting le in a hot or cold frame.
Felt alone molds very neatly once moistened & releases well, and also makes the other two release.
at left top margin
These sands only withstand one casting.
at left top margin
A fat sand which is rendered very smooth, makes it porous.
at left middle margin
A fat metal needs lean sand.
Eau Magistra
Some people think that salt water is not good, because the salt cracks in fire, & consequently should make it porous. a result causes bubbles. There is only wine boiled with elm root.
Charcoal for poncer makes for a good release, but one finds the one of willow make it porous. The one of oak or beech does well without making it porous.
at left middle margin
Try burnt oysters.
Lead
For casting, there is only soft lead that wants to be cast very g hot, and soft tin.
Sand for lead, the most excellent of all, for high and low reliefs
I took ceruse and crushed it dry on porphyry, to make it very fine, then I moistened so much, with well beaten egg glair, that it was like a paste, smoothing it perfectly with the dull side of a knife. I left it a little.
Figure at left bottom margin
at left bottom margin
One ought to mix it well with a knife.
[continued]