Acid Fuchsin, sodium salt

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A dark, green powder that forms a purplish-red solution in water. In very dilute solutions, Acid Fuchsin is used as a pH indicator, turning from red to colorless at pH 12-14. It is also used as a general, nonspecific stain for proteins.

Synonyms and Related Terms

Acid Violet 19; CI 42685; Natriumsalz der Fuchsinsäure (Deut.); fuchsina ácida (Esp.); fucsina acida (It.); sale di sodio (It.); acid magenta; acid rubin; acid roseine; fuchsin acid;


  • Irritating to skin
  • Fisher Scientific: SDS

Physical and Chemical Properties

Soluble in water. Slightly soluble in ethanol.

Maximum absorption wavelength= 540-545 nm.

Composition C20H17N3Na2O9S3
CAS 3244-88-0
Molecular Weight mol. wt. = 585.55

Resources and Citations

  • R.Wolbers, G.Landry, "The Use of Direct Reactive Fluorescent Dyes for the Characterization of Binding Media in Cross Sectional Examinations" in Preprints of the AIC Meeting in Vancouver, 1987.
  • E.Martin, "Some Improvements in the Techniques of Analysis of Paint Media" Studies in Conservation, 22(17):63-67, 1977.
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 106
  • J.Gordon Cook, Handbook of Textile Fibres:II Man-made Fibres, Merrow Publishing Co. , Durham, England
  • Richard C. Wolbers, Nanette T. Sterman, Chris Stavroudis, Notes for Workshop on New Methods in the Cleaning of Paintings, J.Paul Getty Trust, Los Angeles, 1990
  • Aldrich Chemical Catalog