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THE PORCELAIN INLAY 207

provided for this purpose. Lay on the body, and fuse in the
furnace, in layers, to a biscuit bake, jolting the material
into the matrix, and absorbing excess moisture on blotting
paper, before placing in the furnace. In complex cavities,

when the teeth vary in color at the cervix and cutting edge,
build the body in sections instead of layers. Continue adding
the body and partially fusing until the matrix is nearly full,
when the last layers of enamel may be added, carved to

Fig, 257.—S. S. White electric furnace.

form with an inlay cover (Fig. 249) and brought to a full
glaze. With low fusing porcelain and gold matrices, the
case may be invested, to prevent warping. With platinum

matrices, this is not necessary. Avoid putting the porcelain,
when wet, into a hot furnace (Fig. 257) on account of the
danger of producing checks in the porcelain. A small tear
in the matrix, provided it is not on the margin, will do no

damage, as the porcelain, if it runs through, may be removed