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Ionisation: Acid

Chemical structure of Alizarin

Common Name: Alizarin
Suggested Name: Alizarin
Other Names:

C.I. Number: 58000
C.I. Name: Mordant red 11 Pigment red 83
Solubility Aqueous: Sparingly at boiling. Soluble in alkalis.
Solubility Ethanol: Sparingly at boiling. Soluble in alkalis.
Absorption Maximum: 601, 567 (Conn) 609, 567 (Aldrich) 533 (Gurr)
Empirical Formula: C14H8O4
Formula Weight: 240.2


Alizarin is found in the roots of the madder plant (Rubia tinctorum L.), and was used as a dye in ancient times in Egypt, Persia, and India. It is only rarely used in microtechnique, although it has been suggested for demonstrating some metals, with which it forms colored lakes.


  1. R. D. Lillie.
    Conn’s Biological Stains
    Williams & Wilkins, Baltimore, MD., U.S.A.
  2. Aldrich chemical catalogue, 1992
    Aldrich Chemical Company, Milwaukee, WI, USA.
  3. Edward Gurr, 1971
    Synthetic dyes in biology, medicine and chemistry
    Academic Press, London, England.
  4. Susan Budavari, Editor,
    The Merck Index, Ed. 12
    Merck & Co., Inc., Whitehouse Station, NJ, USA