(acetone-chlor-haemin test (Wagenaar test

A presumptive test for blood in which a small amount of acetone (propenal) is added to the bloodstain, followed by a drop of hy­drochloric acid. Haemoglobin pro­duces derivatives such as haematin and haemin, forming small charac­teristic crystals that can be identified under a microscope.

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