- for phenol: on the addition of 5 or 6 drops of hydrochloric acid and then 1 of nitric acid to the suspected fluid, a red color develops;
- for strychnine: fluid is extracted with ether, which is then evaporated by means of “drop-by-drop” pipetting into a warmed porcelain dish or crucible; the residue is treated with drops of manganese dioxide and dilute sulfuric acid; a red-blue or violet color develops if strychnine is present.
- a test for radial or ulnar patency; either the radial or ulnar artery is digitally compressed by the examiner after blood has been forced out of the hand by clenching it into a fist; failure of the blood to diffuse into the hand when opened indicates that the noncompressed artery is occluded.
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Examples: glitazone, GI cocktail, etc.