Red pigment was extracted by means of hydrochloric acid-alchohol solution, and the pigment was purified by use of ether. Based on the changes of red pigment solution under the different pH value and absorption bands,as well as the effect of different metal positive ion on color changes of red pigment in Parthenocissus tricuspidata plach,this pigment was tentatively analyzed .Meanwhile the pigment content was analyzed by use of the improved Fuleki method.
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