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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 saframe 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.

Orberé grain makes a tawny powder, very
delicate & very soft, which once mixed could mix mold
very neatly. Try wheat flour burned over a closed
fire.

