Indanthrone blue

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A synthetic blue Anthraquinone dye. Indanthrone blue was first prepared as an Anthraquinone derivative of indigo by Rene Bohn in 1901. He named the colorant indanthrene, but the name was changed to indanthrone when Indanthrene® became a brand name [I.G.Farbenindustrie A.G.] for the colorant. Indanthrone is rarely used as a colorant because it is similar in hue to Phthalocyanine blue but is more expensive.

Synonyms and Related Terms

Indanthrene® blue [I.G.Farbenindustrie A.G.]; Pigment Blue 60; CI 69800; Vat Blue 4; indanthrene blue R; indanthrene brilliant blue FF; anthraquinone blue; faience blue


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  • Closely related to cancer causing anthraquinones.
  • TCI Chemicals: SDS

Physical and Chemical Properties

  • Turns orange then dissolves in concentrated sulfuric acid. Insoluble in organic solvents.
  • UV max = 278 nm
Composition C28H14N2O4
Molecular Weight mol. wt. = 442.43

Resources and Citations

  • Keijzer, "Microchemical Analysis on Synthetic Organic Artists Pigments Discovered in the Twentieth Century" in ICOM Preprints, Dresden 1990, p. 221-225.
  • M. Doerner, The Materials of the Artist, Harcourt, Brace & Co., 1934
  • Website:
  • A.Scharff, 'Synthetic dyestuffs for textiles and their fastness to washing', ICOM-CC Preprints Lyon, Getty Conservation Institute, Los Angeles, 1999
  • Monona Rossol, The Artist's Complete Health and Safety Guide, Allworth Press, New York, 1994

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