Fig. 2From: Island blues: indigenous knowledge of indigo-yielding plant species used by Hainan Miao and Li dyers on Hainan Island, ChinaIndigo extraction method of Strobilanthes cusia by Hainan Miao dyers. a Strobilanthes cusia harvesting in the home garden. b Removing the rotten aerial parts from the the extraction vat. c Using plastic scoop for aeration. d Ricinus communis seed useBack to article page