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From: Electrochemical assessment of pigments-binding medium interactions in oil paint deterioration: a case study on indigo and Prussian blue

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Molecular structures of the compounds produced by the electrochemical, green arrows, reactions I, II, III, and VI, and the chemical, black arrow, reactions for the various indigo chemical reactions studied herein. The molecular structures shown are for indigo, IND, 1; leucoindigo, LEU, 2; dihydroxyindigo, 3; isatin, 4; 1H-indole-2,3-diol, 5; and dehydroindigo, DHI, 6

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