Page 209 - My FlipBook

PORCELAIN INLAYS 193

to a full gLaze, it will be found that the inlay is
completed just as it was wanted to be. Whatever
may apply as to carefully biscuiting high-fusing
bodies, there is no need to stop short of a wavy
or rough glaze with the Jenkins body.
Careful experiments have proved that the
Jenkins porcelain is one of the strongest, if not
the strongest, porcelain that can be used for inlays.
Over-fusing the Jenkins porcelain and the con-
sequent burning out of the colour, and production
of a porous, friable material, is merely a question of
carelessness or want of experience. As a matter of
fact, it is far easier to watch the fusing of Jenkins
low-fusing porcelain than any of the higher fusing
bodies. The intense heat required with high-fusing
bodies renders it difficult to see what is happenings
and as every kind of porcelain must have an exact
" fusing-point," beyond which is detrimental to
it
proceed, the probabilities are that the necessity for
accurately fusing Jenkins porcelain in order to
maintain the colour, will lead to the production of
a more perfectly fused and consequently stronger
porcelain — quite apart from any intrinsic merit that
it may possess—than can be obtained with a high-
fusing body that cannot be so carefully watched.
The exact place that porcelain inlays occupy as
regards their durability and tooth-saving properties