| http://www.w3.org/ns/prov#value | - vative color using the method for detecting a phenothiazine-derivative color of the present invention, and measuring a presence/absence or an amount of decrease in the added phenothiazine-derivative color.A shifting agent of the present invention is a shifting agent that shifts an absorption spectrum of a phenothiazine-derivative color, comprising at least one color substance selected from the gro
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