Fig. 7

Chromatographic profiles obtained by HPLC–DAD-MS analysis of a purple sample from the ikat textile S2004.89: (a) UV–Vis chromatogram extracted at 550 nm (inserts show the UV–Vis absorbance spectra of the main compounds); (b) extract ion chromatograms obtained by using the m/z values corresponding to the molecular ions [M+H]+ of methyl violet components