088v - - - - - Sand from pulverised rock salt and sand from the mine finely ground on marble
The one and the other, once very finely ground on marble, after having crushed them dry well & beaten in the mortar, I mixed as much of one as the other, and having reworked them together on porphyry, & passed them through a double sieve or through the sleeve of a shirt to mix them even better, I put them in paper & put them on a marble in a cellar. After one night, they had been been moistened enough by themselves without dampened them further, because rock salt, like all other salts, dissolves in dampness. I molded very neatly with it, because both were very finely ground. They want to be f humid enough to release well.
Mineral sand
It does not matter if the color is white or yellow. Above all it must be in one piece, & as if taken from a quarry or rock formation, & the deeper one takes it from, the better. The signs of its goodness is that it is thus amassed, and that when removing in the form of rock, it comes out in lumps & qu pieces which demonstrates its bond, & that it is not too lean.
However, it should break apart between your hands & have very small men & delicate grains & of the same nature. If it is not delicate enough, you can pass & grind it finely, either through water, or through a sieve, & when it or on the porphyry, & in this way, from sil leanness they become fat & well bound. You can mold with it in a sa frame or in a noyau without cloth waste, & try it with lead, for if with this one it does not become porous & casts neatly, it will also behave well with copper. Some say that the fat sands do not want the metal to be cast too hot. Artisans who work on big works & to save time, do not need to grind & seek the curiosities of artificial sands, benefit from seeking some ready made in nature, which has the finest grain possible, & for small works, they only pass it only through a sieve. But those who work in small works, finely grind it & grind it impalpable, because they do not need a lot of it.
at left middle margin
The bled orbère makes a tawny powder, very delicate & very soft, which once mixed could mix mold very neatly. Try wheat flour burned over a closed fire.