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<br />I <br /> <br />I <br /> <br />I <br /> <br />/2$ -0 <br /> <br />MARIHUANA: <br />QUININE: <br /> <br />Hashish, Cannabinol, THG.. Marihuana <br /> <br />Strychnine, Quinine <br /> <br />The color tests \"e developed are listed in Table I along 1>ii th the <br /> <br /> <br />family of drugs which can be identified by each test. <br /> <br /> <br />II. Thin-Layer Chromatography System <br /> <br /> <br />When a street drug sample contains a mixture of drugs" it becomes <br /> <br /> <br />difficult to identify the constituents of the drug mixture by color tests <br /> <br />alone for unique colors will not appear. In these cases, thin-layer <br /> <br /> <br />chromatography can be used to separate the cOnstituents of the drug mix- <br /> <br /> <br />ture and identify them when compared 'loa set of standards. Thin-layer <br /> <br /> <br />chromatography consists of a glass plate coated with a chemical, called <br /> <br /> <br />silica gel, being placed in a container that has a liquid mixture of <br /> <br /> <br />chemicals in the bottom of it. Before placing the coated plate in the <br /> <br /> <br />container, the plate is Spotted with a SOlution of the drug mixture as <br /> <br />well as with solutions of known drugs. As the plate sits in the container, <br /> <br />the liquid mixture of chemicals is absorbed by the silica gel on the plate <br /> <br /> <br />and rises up the plate. As it rises up the plate, it attracts the drugs <br /> <br /> <br />of the mixture and pulls them along with it. Depending on the attractive <br /> <br /> <br />force of the liquid chemical mixture for each drug of the drug mixture, <br /> <br />each drug will be pulled a different distance up the plate. After the <br />liquid mixture of chemicals has risen a given distance up the plate, the <br /> <br />plate is removed from the Container and allowed to air dry. After drYing, <br />