Jump to navigation Jump to search
Magenta dyed silk dress
MFA# 50.4042


A synthetic aniline dyestuff that is also called Magenta. Magenta was the second synthetic dye material to be produced from coal-tar derivatives. It was first noticed by Natanson in 1856. Then in 1859, Verguin patented a large scale production method for making magenta by oxidizing crude aniline with Stannic chloride, a tanning solution. Magenta is a dark green water soluble powder that oxidizes to forms a deep red fugitive dye. It is used to color textiles and Leather and to stain bacteria. Magenta was formerly used in watercolor paints but has since been replaced by colors with better lightfastness properties.

Synonyms and Related Terms

rosaniline hydrochloride; CI Basic Red 9; CI 42510; Basic Violet 14; p-fuchsin; Solvent Red 41 (base); fuchsin; Magentarot (Deut.); magenta (Fr., Ned., Port.); fuschine (Fr.); fucsina (It.); basic fuchsin; fuchsine; azaleine (marketing name for magenta prepared by the Gerber Keller process); rosaniline chloride

Chemical structure



  • Suspected carcinogen.
  • ThermoFisher: SDS

Physical and Chemical Properties

Soluble in water, alcohol, acetone

Composition C20H20N3Cl
CAS 632-99-5
Melting Point 250 C
Density 1.22 g/ml
Molecular Weight mol. wt. = 337.85

Resources and Citations

  • R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966 Comment: Natanson =1856
  • Reed Kay, The Painter's Guide To Studio Methods and Materials, Prentice-Hall, Inc., Englewood Cliffs, NJ, 1983
  • Ralph Mayer, A Dictionary of Art Terms and Techniques, Harper and Row Publishers, New York, 1969 (also 1945 printing)
  • Thomas B. Brill, Light Its Interaction with Art and Antiquities, Plenum Press, New York City, 1980 Comment: Verguin patented process in 1859
  • F. Crace-Calvert, Dyeing and Calico Printing, Palmer & Howe, London, 1876 Comment: Natanson = 1856; Verguin = 1859
  • A.Scharff, 'Synthetic dyestuffs for textiles and their fastness to washing', ICOM-CC Preprints Lyon, Getty Conservation Institute, Los Angeles, 1999 Comment: discovered 1856
  • Colour Index International online at www.colour-index.org

Retrieved from "https://cameo.mfa.org/index.php?title=Fuchsin&oldid=91823"