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Naphthol yellow S is an organic compound that is a dye. It is a derivative of 1-naphthol. At one time it was a popular food colorant but it was delisted in 1959 in the U.S.[2]

Naphthol yellow S[1]
Naphthol yellow S.png
IUPAC name
Disodium 5,7-dinitro-8-oxidonaphthalene-2-sulfonate
Other names
Acid Yellow 1; Food Yellow 1; Sodium flavianate; Flavianic acid, sodium salt; C.I. 10316, Acid Yellow S, Amacid Yellow S, C.I. 10316, C.I. Acid Yellow 1, C.I. Food Yellow 1
3D model (JSmol)
ECHA InfoCard 100.011.537
Molar mass 358.19 g·mol−1
Appearance yellow solid
S-phrases (outdated) S22 S24/25
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references


  1. ^ Naphthol Yellow S at Sigma-Aldrich
  2. ^ Sharma, Vinita; McKone, Harold T.; Markow, Peter G. (2011). "A Global Perspective on the History, Use, and Identification of Synthetic Food Dyes". Journal of Chemical Education. 88: 24–28. doi:10.1021/ed100545v.