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smalt, and which makes it black; it then remains purified and clean;
and if you grind it on porphyry the porphyry will work up and mix
with the smalt and spoil it, and aqua fortis will never remove it
because it cannot dissolve the porphyry.
If you want a fine blue colour dissolve the smalt made with tartar,
and then remove the salt.
Vitrified brass makes a fine red.
7
29.
STUCCO.
Place stucco over the prominence of the..... which may be composed
of Venus and Mercury, and lay it well over that prominence of the
thickness of the side of a knife, made with the ruler and cover this
with the bell of a still, and you will have again the moisture with
which you applied the paste. The rest you may dry [Margin note: On
stucco (729. 730).] [Footnote: In this passage a few words have been
written in a sort of cipher--that is to say backwards; as in l. 3
erenev for Venere, l. 4 oirucrem for Mercurio, l. 12 il
orreve co ecarob for il everro (?) co borace. The meaning of the
word before "di giesso" in l. 1 is unknown; and the sense, in
which sagoma is used here and in other passages is obscure.--
Venere and Mercurio may mean 'marble' and 'lime', of which
547
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