Important: Safety Warning
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.
In addition, this page contains cosmetic recipes using substances now known to be poisonous, such as lead, mercury, or arsenic compounds, which cause cumulative and serious harm when absorbed through the skin or eyes.
This information has been left in for historical purposes but should not be acted upon.
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Writing on Glass
This may be done with a piece of French chalk, or crayons prepared for the purpose; or even sufficient oil of vitriol to form a thin paste, with a common pen held nearly perpendicular.
India ink, or, when the article will be exposed to damp, shellac varnish, thickened with a Little vermilion or lampblack, for red or black color, is best adapted for the purpose. Common ink is not sufficiently opaque.