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Chemistry · L5 · Luminol Forensic Reaction Pathway

How luminol reveals invisible trace blood at a crime scene: iron in haemoglobin catalyses luminol's reaction with hydrogen peroxide, directly producing an excited-state product that emits a blue glow.

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Luminol, basic solutionReact with H2O2Hydrogen peroxide H2O2Trace iron from haemoglobin in blood residueExcited-state aminophthalate productBlue light emittedCatalyses reactionRelaxes to ground state
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