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6
45.
Very thin glass may be cut with scissors and when placed over inlaid
work of bone, gilt, or stained of other colours you can saw it
through together with the bone and then put it together and it will
retain a lustre that will not be scratched nor worn away by rubbing
with the hand.
6
46.
TO DILUTE WHITE WINE AND MAKE IT PURPLE.
Powder gall nuts and let this stand 8 days in the white wine; and in
the same way dissolve vitriol in water, and let the water stand and
settle very clear, and the wine likewise, each by itself, and strain
them well; and when you dilute the white wine with the water the
wine will become red.
6
47.
Put marcasite into aqua fortis and if it turns green, know that it
has copper in it. Take it out with saltpetre and soft soap.
6
48.
A white horse may have the spots removed with the Spanish haematite
58
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