Mecke's test

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A presumptive test for amphetamines, methamphetamines, and heroin. Mecke's reagent consists of 1 gram of selenious acid in 100 ml of concentrated sulphuric acid. Different substances give different results. Ecstasy, for example, gives a light blue colour, turning to turquoise, and then dark blue. Heroin gives a yellow colour changing to green. LSD gives an olive-green colour, changing to black. Mescaline gives a brownish-orange colour.

Subjects: Chemistry.

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