Fig. 7From: A courtly brocade belt belonging to Qajar period (1789–1925), IranThe ESI-mass spectrum (positive ions) of the extracted dye from yellow yarns and the detection of an ion at m/z 443, related to epi/catechin gallate (a); The negative ESI-mass spectra shows ions at m/z 290 related to epi/catechin (b), m/z 786 related to gallotannins and gallic acid derivatives (c) and m/z 169 for gallic acid (d)Back to article page