Fig. 6From: Identity blues: the ethnobotany of the indigo dyeing by Landian Yao (Iu Mien) in Yunnan, Southwest ChinaTannin-rich species added to the second dyeing solution. a The large (15-cm diameter) stem of the forest liana Spatholobus suberectus. b Cut stem showing characteristic red exudate. c Cut sections of Spatholobus suberectus stem. d Sliced tubers of Dioscorea cirrhosa soaking in the water. e Residue of Dioscorea cirrhosa after dyeing. f Wild harvested Dioscorea cirrhosa tuberBack to article page