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 directs the use of hazardous substances — such as benzine, gasoline, lye, or strong acids — for household tasks. These materials are highly flammable, corrosive, or poisonous, and the practices described have caused fires, burns, and poisonings.
This information has been left in for historical purposes but should not be acted upon.
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Another (Write with a solution of sugar)
Write with a solution of sugar of lead or tartar emetic; moisten the writing (or drawing) and expose to a current of sulphuretted hydrogen gas. The lead will turn black, and the antimony orange brown.
Chemical Landscapes.
These are drawn partly in Indian-ink and partly in sympathetic inks, which are only visible when gently heated. The picture represents ordinarily a winter scene, but when heated the sky becomes blue, the leaves green, and flowers and fruit are seen. The materials are as follows: Green, chloride of nickel; blue, pure chloride or acetate of cobalt; yellow, chloride of copper; brown, bromide of copper. If the picture is too highly heated it will not again fade.