Scarlet GN

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Scarlet GN
Kekulé, canonical skeletal formula of scarlet GN ((6E)-6-hydrazinylidene)
Systematic IUPAC name
Disodium 3-[(2,4-Dimethyl-5-sulfonatophenyl)hydrazinylidene]-4-oxonaphthalene-1-sulfonate
Other names
Crimson 4R; C.I. Food Red 1; Food red 1; FD & C Red no. 4; Hexacol Ponceau SX; Maple Ponceau SX; Ponceau SX; Purple 4R; E125
3D model (JSmol)
ECHA InfoCard 100.019.870
EC Number 221-856-3
E number E125 (colours)
Molar mass 480.42 g·mol−1
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

Scarlet GN, or C.I. Food Red 1, Ponceau SX, FD&C Red No. 4, or C.I. 14700 is a red azo dye once used as a food dye. As a food additive, it has the E number E125. It usually used as a disodium salt.

In the United States, it is not permitted for use in food or ingested drugs and may only be used in externally applied drugs and cosmetics.[1][2][3] An exception was added in 1965 to allow the coloring of maraschino cherries, which then were considered mainly decorative and not a foodstuff.[4] This exception was repealed in 1976 due to mounting evidence over its safety concerns. In the European Union, it is not permitted as a food additive.[5]


  1. ^ 21 C.F.R. 81.10
  2. ^ 21 C.F.R. 81.30
  3. ^ 21 C.F.R. 82.304
  4. ^ Pavia, Donald L. (2005). Introduction to Organic Laboratory Techniques: A Small Scale Approach (2nd ed.). pp. 387–389. Retrieved January 25, 2013.
  5. ^ Current EU approved additives and their E Numbers, Food Standards Agency