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Presumptive Test for Blood

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First published at 14:18 UTC on April 10th, 2020.

#chemistry
#forensics
#demonstrations

mrjordan

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This is one of the presumptive (screening) tests for blood. It uses phenolpthalin being oxidized by oxygen to phenolpthalein. In a basic solution, phenolpthalien is pink, but phenolpthalin is colorless. The catalase in blood catalyzes the decomposition of hydrogen peroxide to oxygen, causing the oxidation. Iodide ion will also catalyze that decomposition.

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