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Updated: October 21, 2026
If this foil be dried, cut up, put in a reduction-tube, and heated, crystals of arsenious trioxide will be deposited on the cold part of the tube. These tests are difficult to apply, but as arsenic is a ubiquitous poison, and as there are many sources of fallacy, it would be well, when possible, to obtain the services of an expert. Biological Test.