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PRESUMPTIVE BLOOD TEST

PRESUMPTIVE BLOOD TEST. Kastle -Meyer Color Test. Fast and easy test used at the crime scene to test for the presence of blood The heme portion of the red blood cell reacts with hydrogen peroxide to oxidize phenolphthalein and give a pink product. Presumptive Test.

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PRESUMPTIVE BLOOD TEST

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  1. PRESUMPTIVE BLOOD TEST

  2. Kastle-Meyer Color Test • Fast and easy test used at the crime scene to test for the presence of blood • The heme portion of the red blood cell reacts with hydrogen peroxide to oxidize phenolphthalein and give a pink product

  3. Presumptive Test • If the test is positive, blood may be present and further analysis of the residue may provide additional information • The disadvantage of the test is that it is presumptive • Chemical and plant oxidants from sources other than blood will produce a positive result

  4. Luminol • Luminol powder is mixed with hydrogen peroxide in a spray bottle • The mixture is sprayed on the area to be examined for blood • The iron in blood speeds up the reaction between the peroxide and the Luminol causing the Luminol to glow

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