Page 89 - My FlipBook

the number of shades that can be produced. To ilhistrate still further: ;
A is grav, while G is vvliite or colorless, used principally as a modifier to
get gradations of other colors.
Make mixture of varying proportions of A and G, thus gA-j-iG
:
then another mix 9A-^2G, and so on. By combining each of the other
shades in this way with G, two hundred and fifty gradations will be pro-
duced, and this is only the beginning of the possible combinations.

Fig. 93.

Fig. 94.

jP" BM

Fig. 95.

Fig

The method just described answers very well if the texture of the
porcelain is coarse like that of the Allen and Close bodies ; but if the
texture is fine, like that of most porcelain now used, there will be more
or less difficulty in removing the porcelain from the mold. This dif-
ficulty is due to the close adaptation of the fine particles of porcelain.
When making new shade samples from a fine texture porcelain, the
same mold (Fig. 92) can be used, but the method of using must be
changed. In place of mixing the porcelain with ordinary water and
pressing the mold into the porcelain, it is advisable to use gum water and

85