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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To Stain or Color Glass
Different colors are given to glass by the addition of metallic oxides. Thus, for amethyst, oxide of manganese is used; for blue, oxide of cobalt; for brown, oxide of iron; for green, black oxide of copper; for purple, oxide of gold; for ruby red, suboxide of copper; for of tin; for yellow, oxide of silver, &c. These substances are either added to the melted contents of the glass-pot, as in preparing artificial gems (see No. 2419), or are applied in a thin layer to the surface of the object, which is then heated until the coloring compound fuses as in enameling. (See No. 2378.) .71.8 Henderson, C. E., we are able to furnish the composition of both. The French glass is composed of silicic acid, 72.1 parts; soda, 12.2 parts; parts; and lime, 15.7 parts; including some and oxide of iron.
In Birmingham it is made from 560 pounds 2363. English Light-House Glass.
French sand , 203 pounds carbonate of soda, and 3 pounds arsenious acid. The best qual- 63 pounds lime, 28 pounds nitrate of soda, ities of this glass are at present produced in the Siemens furnace.