Why do you typically add reagent

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In a colour spot test, why do you typically add a reagent (e.g. Marquis) to a spot plate prior to adding the drug specimen to be tested? In a colour spot test, why do you typically add a reagent (e.g. Marquis) to a spot plate prior to adding the drug specimen to be tested? To ensure any colour change observed is due to the drug specimen addded. Neither A nor B. To ensure the spot plate is not contaminated. Both A and B.

Reference no: EM133610721

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