title: Field and laboratory test for raw and prepared opium.
abstract: Two new colour tests for opium are described. These may be used alone, as field tests, or in combination with traditional tests rapidly to confirm raw or prepared opium. Absolute confirmation of opium by thin layer chromatography is also useful in the determination of origins. An alternative chromogen to the Dragedorff reagents is described, although iodoplatinate remains the preferred chromogen.
mesh_terms: D002855:Chromatography, Thin Layer; D006213:Hallucinogens / Q000032:analysis; D007202:Indicators and Reagents; D008722:Methods; D009892:Opium / Q000032:analysis*; D014364:Tryptophan / Q000032:analysis
chemical_list: D006213:Hallucinogens; D007202:Indicators and Reagents; D009892:Opium; D014364:Tryptophan