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operator to oljtain proper contour without trying the inlay into the cavity,
a more accurate and better contour may be obtained by trying matrices
for large inciso-aj)])roxiiiial inla\s into the cavities after the sections of
enamels have been applied.
The entire mass is now covered and built flush with the margins of
the matrix with a uniform layer of a neutral color and fused (Fig. 114),
after which a layer of a glaze or a second layer of the neutral color of
enamel is applied in such a manner that the porcelain does not overlap the
margins and then fused (Fig. 115). If the details of this method of ap-

FiG. 114. Fig. 115.

plying the porcelain are observed, the finished inlay will be flush with the
margins of the cavity, thus preventing an overlapping of the porcelains.
It is probable that any porcelain that is to be applied to an invested
matrix should be mixed with alcohol. It should be mixed to a cream-like
consistency' and flowed into position with the point of the carver or a
small brush ; it is not to be carved as the porcelain that is mixed with
water. After moistening the matrix with alcohol, fill it almost to the
margin with the paste that is to form the foundation of the inlay. The
alcohol is then evaporated and the porcelain is fired to a high biscuit.
After this firing the investment should be chilled by dipping the base
of the cup in water, using care to prevent the investment from becoming
moist. In case more foundation is required, a second application is made
and biscuited. The enamels, approximating the colors of the various

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