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Updated: April 30, 2025
Colonel Ashley looked after her for a moment, as though half of a mind to follow, and then, slowly shaking his head, he again picked up the paper he had been reading, delving through a maze of technical poisoning detection formulae, from Vortmann's nitroprusside test to a consideration of the best method of estimating the toxicity of chemical compounds by blood hemolysis.
On adding the nitroprusside solution to a fresh portion of wool boiled with caustic soda, to dissolve out the sulphur, a splendid purple coloration is produced. Fur and hair would, of course, do the same thing. Lead solutions have been used for dyeing the hair black; not caustic alkaline solutions like this, however.
The first-named is very sensitive to sulphur, and turns black directly. To show this, we take a quantity of flowers of sulphur, dissolve in caustic soda, and add to the lead solution. It turns black at once, because the sulphur unites with the lead to form black sulphide of lead. The nitroprusside, however, gives a beautiful crimson-purple coloration.
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