| http://www.w3.org/ns/prov#value | - first detection method of the present invention is a method for measuring a target component in a sample by detecting a phenothiazine-derivative color, comprising steps (A) to (E) below:(A) a step of producing an oxidizing substance or reducing substance from the target component in the sample;(B) a color-developer-adding step of adding, to the sample, a color-developer that produces a phenothiaz
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