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presumptive test


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A simple test for a given substance using a reagent that changes colour when mixed with the substance under investigation. Presumptive tests are not definitive and further confirmatory tests are always required. They are used extensively in forensic science. Examples are the Duquenois-Levine test for marijuana and Scott's test for cocaine. In general analytical chemistry, presumptive tests are often called spot tests.

Subjects: Chemistry.


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