Enamel, White

Prep. 1. ‘Calcine’ (from 2 parts of tin and 1 part of lead), 1 part; fine crystal gla or ‘frit,’ 2 parts; manganese, a few grains; powder, mix, melt, and pour the fused ma into clean water; again powder, and fuse, and repeat the whole proce 3 or 4 times, avoiding contamination with smoke, dirt, or oxide of iron. A fine dead white. 2. Washed diaphoretic antimony, 1 part; fine gla (free from lead), 3 parts; mix, and proceed as before. Very fine. 3. Lead, 30 parts; tin, 33 parts; calcine as before, then fuse 50 parts of this ‘calcine’ with an equal weight of flints, in powder, and 100 parts of salt of tartar. A fine dead white enamel. Obs. For white enamel, the articles must be perfectly free from foreign admixture, as this would impart a colour. When well managed, either of the above forms will produce a paste that will rival the OPAL .