Where the enameled work is intended to be exposed to the weather do not use flux No. 8, but substitute the following:
| White lead | 1 part |
| Ground flint glass | 1 part |
All the enamels should, after being mixed, be melted in crucibles, poured out when in liquid, and powdered or ground for use.
Fusible Enamel Colors.
The following colors are fusible by heat, and are all suitable for the decoration of china and glass. In the following collection of recipes certain terms are employed which may not be quite understood by persons who are not connected with either the glass or porcelain industries, such as “glost fire” and “run down,” and in such cases reference must be made to the following definitions:
“Run down.” Sufficient heat to melt into liquid.
“Glost fire.” Ordinary glaze heat.
“Grind only.” No calcination required.
“Hard fire.” Highest heat attainable.
“Frit.” The ingredients partly composing a glaze, which require calcination.