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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Indestructible Inks
Employed for writing the labels on bottles containing strong acids and alkaline solutions. They are capable of resisting the action of iodine, chlorine, alkaline lyes and acids, as well as operations of dyeing and bleaching, besides being an excellent and cheap material for marking linen, as nothing will remove them without destroving the fabric. porphyry slab, with a muller, gold or silver 2527. Hausmann's Indestructible leaves with white honey, until they are re- Ink. Mix 1 part genuine Trinidad asphaltum duced to the finest possible state of division. with 4 parts oil of turpentine; color with a sufficiency of plumbago, for black, or vermilion | become black by dipping the paper in a solufor red ink. tion of ammonia.
Chloride of mercury will turn black when wetted with chloride of tin.
A weak infusion of galls is turned black by sulphate of iron (copperas).
Reversing the above, writing with copperas turns black by moistening with infusion of galls.