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This page contains a formula or preparation using substances now known to be dangerously toxic, such as arsenic, mercury, lead, or cyanide compounds. Exposure to these substances can cause severe poisoning, permanent injury, or death.
In addition, this page describes trade processes that use dangerously toxic materials such as cyanide solutions, mercury amalgams, or strong acids. These processes require training, equipment, and precautions far beyond what the text describes.
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To Etch on Glass
Etching with The precise qualities of the products of the hydrofluoric acid on plate glass is practiced following processes depend greatly upon the now to a very considerable extent, the French duration and degree of heat employed. By manufacturers especially producing splendid increasing the quantity of sand, glass, or flux, ornamental effects by this process. The the enamel is rendered more fusible, and the drawings to be imitated or etched on the glass opacity and whiteness is increased by the addi- ENAMELS. tion of oxide of tin. The use of borax should be avoided, or used very sparingly, as it is apt to make the enamel effloresce and lose color.
I. Red lead, 16 parts; calcined borax, 3 parts; powdered flint glass, 12 parts; powdered flints, 4 parts; fuse in a Hessian crucible for 12 hours, then pour it out into water, and reduce it to a powder in a biscuit-ware (unglazed porcelain) mortar. II. Powdered flints, 10 parts; nitre and white arsenic, of each 1 part as last.
III. Flint glass, 3 ounces; red lead, 1 ounce; as last.
IV. Red lead, 18 parts; borax (not calcined), 11 parts; flint glass, 16 parts; as last. V. Flint glass, 6 parts; flux No. II, above, 4 parts; red lead, 8 parts; as last.
III. Copper dust and litharge, of each 2 ounces; nitre, 1 ounce; sand, 4 ounces; flux, as much as required.
IV. Add oxide of chrome to a sufficient quantity of flux to produce the desired shade; when well managed the color is superb, and will stand a very great heat; but in careless hands, it frequently turns on the dead-leaf tinge.
V. Transparent flux, 5 ounces; black oxide of copper, 2 scruples; oxide of chrome, 2 grains. Resembles the emerald.
VI. Mix blue and yellow enamel in the required proportions.