xylindein


From The Collaborative International Dictionary of English v.0.48:

Xylindein \Xy*lin"de*in\, n. (Chem.)
   A green or blue pigment produced by Peziza in certain kinds
   of decayed wood, as the beech, oak, birch, etc., and
   extracted as an amorphous powder resembling indigo.
   [1913 Webster]
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