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This work can be made immediately profitable in experience, for he will
need a set of sample shades made from the materials he is to work with.
He will find greater satisfaction in workinij to shades of his own com-
pounding than with any fixed samples of mixes supplied by the manu-
facturers of the material. Of course, in making these buttons he will
need to note carefully the e.xact proportions in each experiment. He will
thus have an invaluable record, and every experiment will serve as a
guide in his future practical work ; the failures advising him what to
avoid, the successes pointing the clear way to useful results."

Fig. 92.

A practical method of making new shades from
making Shade the powders furnished by the manufacturers is to
Samples. carve a suitable form in plaster, wood or metal, and
from such a form make a mold with Melotte's metal.
(Fig. 92.) By the use of such a mold new shade forms of uniform
shape and size can be made.
Weigh out varying proportions of the different colored powders
and mix with water to the consistency of dough, then oil and press it
into the mixed porcelain. If the mold has been properly made, an imprint
of the desired form will be made in the porcelain, and this when properly
trimmed and fired will record the new shade so produced.
Care should be taken to record the various mixtures so that they may
be duplicated at any time. The keeping of such records may be made in
this way—using the letters of the S. S. White Dental Manufacturing Com-
pany's porcelain to illustrate : Three parts of A added to two parts of B
will produce a new shade, which can be designated as No. i, or by any
name desired, and can be recorded thus: 3A-|-2B=No. i. It will be
observed that by making shades as here suggested there is no limit to
Illustrations 92-96 from "Notes on Dental Porcelain" by courtesy of the
author, Dr. V. Walter Gilbert, and the S. S. White Dental Manufacturing Co.

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