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482
are more brittle, and do not maintain so well the sudden tran-
sitions of heat and cold ; their brittleness is increased on
account of the different degrees of heat to which they must
be submitted.
This is so true, that all those which have no platina, or the
filings of gold, in their composition, are so very brittle, that
it is almost impossible to work them. It would be easy for
me to point out here the dentists who do not combine platina
with the clay with which the teeth are made, but we think
they will do so when they learn it is very useful.
§ xi. Of Standard Gold in Filings*
I think that standard gold gives permanently yellow tints
which will resist the action of the most intense heat ; the dif-
ferent trials to which I have submitted it, justify my saying
so. Used by itself, it gives to the enamel of the tooth a yel-
low red colour, a little too lively, but which may be weak-
ened with the oxide of titanium ; then it renders the enamel
of a very natural colour. I am ignorant whether those, who,
like me, make incorruptible teeth, have had recourse to this
means, but it is certain that it is one of the best colouring
principles.
To grind gold fine, we begin by filing it with a very fine
file, or a file of the finest kind ; it is in filings it is weighed,
* It is easy to make gold fine enough by filing it with a very fine file,
grinding it immediately with the other substances which enter into the com-
position of incorruptible teeth, it divides perfectly well; it is in this way
that I have for a long time used it : but if it is wanted in very fine powder,
the gold-beaters can furnish it; that which I have had for some time was
obtained from them. Up to the present time I have myself filed the platina,
but it would be better to have it prepared by a gold-beater, after the same
means they employ for reducing gold to powder.
482
are more brittle, and do not maintain so well the sudden tran-
sitions of heat and cold ; their brittleness is increased on
account of the different degrees of heat to which they must
be submitted.
This is so true, that all those which have no platina, or the
filings of gold, in their composition, are so very brittle, that
it is almost impossible to work them. It would be easy for
me to point out here the dentists who do not combine platina
with the clay with which the teeth are made, but we think
they will do so when they learn it is very useful.
§ xi. Of Standard Gold in Filings*
I think that standard gold gives permanently yellow tints
which will resist the action of the most intense heat ; the dif-
ferent trials to which I have submitted it, justify my saying
so. Used by itself, it gives to the enamel of the tooth a yel-
low red colour, a little too lively, but which may be weak-
ened with the oxide of titanium ; then it renders the enamel
of a very natural colour. I am ignorant whether those, who,
like me, make incorruptible teeth, have had recourse to this
means, but it is certain that it is one of the best colouring
principles.
To grind gold fine, we begin by filing it with a very fine
file, or a file of the finest kind ; it is in filings it is weighed,
* It is easy to make gold fine enough by filing it with a very fine file,
grinding it immediately with the other substances which enter into the com-
position of incorruptible teeth, it divides perfectly well; it is in this way
that I have for a long time used it : but if it is wanted in very fine powder,
the gold-beaters can furnish it; that which I have had for some time was
obtained from them. Up to the present time I have myself filed the platina,
but it would be better to have it prepared by a gold-beater, after the same
means they employ for reducing gold to powder.
