Fig. 1From: Organic colorants based on lac dye and brazilwood as markers for a chronology and geography of medieval scriptoria: a chemometrics approachChemical structures of brazilein, laccaic acid A, laccaic acid B, C and E (B, R = CH2CH2OH; C, R = CH2CHNH2COOH; E, R = CH2CH2NH2), laccaic acid D, and erythrolaccin. For laccaic acid A the main sites for complexation with a metal ion are shownBack to article page