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Naphthol Yellow S

Dye

Naphthol Yellow S

Class: Nitro
Ionisation: Acid

Chemical structure of Naphthol Yellow S

Common Name: Naphthol yellow S
Suggested Name: Naphthol yellow S
Other Names:

Sulfur yellow S,
Acid yellow S

C.I. Number: 10316
C.I. Name: Acid yellow 1
Color: Yellow
Solubility Aqueous: 8%
Solubility Ethanol: 8%
Absorption Maximum: 428, 392 (Conn) 427, 390 (Gurr)
Empirical Formula: C10H4N2O8SNa2
Formula Weight: 358.2 (Aldrich, Merck), 412.254 (Conn)

Description

This dye has been recommended by Shoobridge for use as a staining "primer" in his polychrome method. Its free acid is called flavianic acid.

References

  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. Susan Budavari, Editor.
    The Merck Index, 12 ed.,
    Merck & Co., NJ, USA
  4. Edward Gurr, 1971
    Synthetic dyes in biology, medicine and chemistry
    Academic Press, London, England.