Indanthrene

[in-dan-threen]
Trademark.
  1. a blue, crystalline, water-insoluble solid, C28H14H2O4, used as a dye for cotton and as a pigment in paints and enamels.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Historical Examples of indanthrene