250. WHITE

The white enamel of commerce in cakes.


251. YELLOWISH GREY

Yellow No. 252, 1 part; blue No. 233, 1 part; oxide of zinc, 2 or 3
parts; flux No. 2, 5 parts; sometimes a little black is added,
according to the tone which the mixture produces. The proportions of
the blue and yellow vary.


252. YELLOW FOR BROWNS & GREENS

Antimonic acid, 2 parts; sulphate of iron 1 part; flux No. 1, 9
parts. This colour is melted and sometimes a little Naples Yellow is
added if it is too soft, i.e., melts too easily.


253. BLUEISH GREY FOR MIXTURES

Blue previously made by melting together three parts of flux No. 1,
and one part of the mixture of oxide of cobalt, 8 parts; oxide of
zinc, 1 part; sulphate of iron calcined at a forge heat, 1 part;
flux No. 2, 3 parts; triturate and add a little manganese in order
to render it more grey.