ABC-BIO Practice Questions - ABC Biological Evidence Screening Certification (ABC-BIO) Exam

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Why must hydrogen peroxide be added AFTER the phenolphthalin reagent during a Kastle-Meyer test rather than simultaneously?

To prevent false-positive color from atmospheric oxidation of reduced phenolphthalin To dissolve the dried blood To buffer the reaction to neutral pH To denature contaminating proteins

Correct Answer:

To prevent false-positive color from atmospheric oxidation of reduced phenolphthalin

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