Qing Dai (traditional Chinese medicine)
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Qingdai (青黛) or Qing Dai, a traditional Chinese medicine, is derived from dried leaves and stems of Baphicacanthus cusia (Nees) Bremek., Polygonum tinctorium Ait., or Isatis indigotica Fortune (Fort.).
Qingdai was first recorded in Yaoxinglun.
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