Alizarin yellow

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Alizarin yellow crystallizes as orange-brown needles from a dilute glacial Acetic acid solution. Developed in 1887 by R. Nietzki, it became the first azo Mordant dye. Alizarin yellow produces a dull yellow-brown, transparent pigment when precipitated on an inert base that has poorer color stability than alizarin. The sodium salt of alizarin yellow is used as an aqueous acid-base indicator. It changes from yellow at pH 10.2 to red at pH 12.0.

Synonyms and Related Terms

Mordant Yellow 1; CI 14030; alizarine yellow R; p-nitrophenylazosalicylate acid; 2-hydroxy-5-[(4-nitrophenyl)azo]benzoic acid; amarilo de alizarina (Esp.); jaune d'alizarine (Fr.); giallo d'alizarina (It.); amarelo de alizarina (Port.)

Chemical structure

Alizarin yellow.jpg


Fisher Scientific: MSDS

Physical and Chemical Properties

Soluble in water and ethanol. Slightly soluble in acetone and Cellosolve®. Insoluble in other organic solvents.

Composition C13H9N3O5
CAS 584-42-9
Molecular Weight mol. wt. = 309.20

Resources and Citations

  • Ralph Mayer, A Dictionary of Art Terms and Techniques, Harper and Row Publishers, New York, 1969 (also 1945 printing)
  • A.Scharff, 'Synthetic dyestuffs for textiles and their fastness to washing', ICOM-CC Preprints Lyon, Getty Conservation Institute, Los Angeles, 1999 Comment: p.654-660
  • Colour Index International online at Comment: developer, date, CAS#=584-42-9, structure verified
  • Sigma Dyes, Stains and Natural Pigments, Infrared Library, Nicolet, 1991-1995 Comment: CAS#=2243-76-7
  • Website: