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.
This information has been left in for historical purposes but should not be acted upon.
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Horticultural ink
-Dissolve 100 grs. of chloride of platinum in a pint of water. A little mucilage and lampblack may be added.
Another. Mix thoroughly 2 parts (by weight) verdigris, 2 of sal amoniac, 1 of lampblack, and 30 of water. Always shake well before using, and comes of the consistence of jelly; then, having blackened an earthen plate, by holding it over the flame of a candle, mix up, with a camel-hair pencil, the fine lampblack thus obtained with some of the above size, while the plate is still warm.
This black requires no grinding, and produces an ink of the same color, which works as freely with the pencil, and is as perfectly transparent as the best Indian-ink.