Important: Safety Warning
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.
This information has been left in for historical purposes but should not be acted upon.
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Naples Yellow
Mix 12 parts metallic antimony, 8 parts red lead, and 4 oxide of zinc, and calcine in a reverberatory furnace. The mixed oxides are rubbed to gether, fused, and the fused mass elutriated into a fine powder. (Dr. Ure.) M. Guimel recommends 1 part well-washed antimoniate of potash to be ground into a paste with 2 parts red lead, and the powder exposed to a red heat for 4 or 5 hours, keeping the heat moderate. This is a good pigment, and may safely be used with oil. room-like concretions of a very black carbonaceous matter, and exceedingly light, will be formed at the summit of the cone, and must be collected from time to time. This black may be rendered less oily and drier by calcination in close vessels. The funnel should be united to the pipe, which conveys off the smoke, by means of wire, because solder would be melted by the flame of the lamp.