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Principle: Test to determine the addition of oxidation substances. When oxidants (chlorine, hydrogen peroxide, pyridiniumchlorochromate, etc.) are present, the test paper changes to turquoise or light to dark blue.
Evaluation: Oxidants, such as bleaching agents, are not normally found in urine. The presence of such substances in a urine sample is an indication that the sample has been manipulated.
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