Orcein and Litmus

@article{Beecken2003OrceinAL,
  title={Orcein and Litmus},
  author={Hermann Beecken and E. M. Gottschalk and U v Gizycki and Hans Kr{\"a}mer and Dieter Dr Maassen and Hans Georg Dr. Matthies and Hans Musso and Claus Dipl Ing Rathjen and Ul Zdhorszky},
  journal={Biotechnic \& Histochemistry},
  year={2003},
  volume={78},
  pages={289 - 302}
}
Orcein was separated into 14 dyes by partition chromatography. Their constitutions were determined mainly by spectroscopy and led to formulae that are derived from 7-amino-2-phenoxazone, 7-hydroxy-2-phenoxazone, and 7-amino-2-phenoxazime, and that were confirmed by syntheses. The major constituent of litmus is assembled polymerically from 7-hydroxy-2-phenoxazone chromophores. The mechanism of formation is elucidated. 
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