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479
It follows from this circulation, that the colour of the liv-
ing tooth, has some life and animation in it ; a light red col-
our, which properly speaking, the dead tooth does not pos-
sess. The oxide of gold has the property of communicating
to the substances into which it enters, a certain life and ani-
mation, without which, the colour of the incorruptible tooth
would appear like a dull unpolished thing : but as excess is a
failing, it is to be moderately mixed according to certain lim-
its and the vivifying property of this colouring principle giv-
en it.
It will be wanted to colour the gum of certain pieces,
which it is sometimes necessary to make.
§ ix. Of the Ammoniated Muriate of Platina.
The muriate of platina like the oxide of gold, possesses a
most active colouring principle : it is very fixed in the fire,
and its result almost always the same. It can be used but in
extremely small proportions, without which it will predomi-
nate over those of the other oxides with which, being mixed,
it combines very well.
Used by itself, it produces a dark brown colour, and uni-
ted to the oxides of titanium and gold, it produces very deli-
cate greyish tinges. Combined in various proportions, it
produces the most natural colours.
§ x. Of Platina.
Platina is, of all the metals, the only one which resists the
different chemical re-agents ; the only one that is capable of
supporting the greatest degrees of heat without melting. It
cannot be fused without joining with a solvent ; this infusi-
bility, which distinguishes it from the other metals, has giv-
—
479
It follows from this circulation, that the colour of the liv-
ing tooth, has some life and animation in it ; a light red col-
our, which properly speaking, the dead tooth does not pos-
sess. The oxide of gold has the property of communicating
to the substances into which it enters, a certain life and ani-
mation, without which, the colour of the incorruptible tooth
would appear like a dull unpolished thing : but as excess is a
failing, it is to be moderately mixed according to certain lim-
its and the vivifying property of this colouring principle giv-
en it.
It will be wanted to colour the gum of certain pieces,
which it is sometimes necessary to make.
§ ix. Of the Ammoniated Muriate of Platina.
The muriate of platina like the oxide of gold, possesses a
most active colouring principle : it is very fixed in the fire,
and its result almost always the same. It can be used but in
extremely small proportions, without which it will predomi-
nate over those of the other oxides with which, being mixed,
it combines very well.
Used by itself, it produces a dark brown colour, and uni-
ted to the oxides of titanium and gold, it produces very deli-
cate greyish tinges. Combined in various proportions, it
produces the most natural colours.
§ x. Of Platina.
Platina is, of all the metals, the only one which resists the
different chemical re-agents ; the only one that is capable of
supporting the greatest degrees of heat without melting. It
cannot be fused without joining with a solvent ; this infusi-
bility, which distinguishes it from the other metals, has giv-
