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colour tests Archives » Analytical Toxicology

Drugs Toxicological Analysis

Colour tests

For some substances, the colour reaction with a particular chemical reagent may be quite specific, but it is much more common for the colour to be produced by a class of compounds. Moreover, compounds that do not fall into the class may also give colours. For some of the tests, the colour reactions can be… read more »

Colour tests methods

Amalic acid test (test for xanthines) Method Add to the sample a few drops of 10 M hydrochloric acid followed by a few crystals of potassium chlorate, and evaporate the mixture to dryness. Observe the colour of the residue then add two or three drops of 2 M ammonium hydroxide and again observe the colour. Indications A… read more »

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