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Carmoisine Chemical Structure

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What is Carmoisine (Acid Red 14) ?

Carmoisine, also known as, Azorubine, Acid Red 14, Red 10, and Food Red 3, is a dye belonging to the group of azo dyes. It is a synthetic red food dye consisting of two naphthalene subunits. It is approved in the EU and India but is not on the lists of approved food colors in the U.S. (was listed in 1939 as FD&C Red No. 10, but later removed in 1963) and in Canada. It is often used alone or in conjunction with other synthetic dyes such as Allura red and Ponceau 4R.

Macsen Laboratories is the leading manufacturer and supplier of Carmoisine (Azorubine) dye with ISO certification.
Name of Product Carmoisine
IUPAC Name disodium;4-hydroxy-3-[(4-sulfonatonaphthalen-1-yl)diazenyl]naphthalene-1-sulfonate
Synonyms Azorubine; Food Red 3; Azorubin S; Brillantcarmoisin O; Acid Red 14; Chromotrope FB; Brilliant Crimson Red; FD&C Red No. 10
CAS No 3567-69-9
Molecular Formula C20H12N2Na2O7S2
Molecular Weight 502.4 g/mol
Color Index No 14720
Pubchem CID 19118


SR. No Criteria Limit/Specification
1 Appearance (form) Solid crystalline powder or granules
2 Appearance (color) Reddish-brown to Dark maroon
3 Melting Point > 300 °C (572 °F; 573 K)
4 Solubility Soluble in Water (120g/L), Glycerine, Propylene glycol
Slightly soluble in Ethanol
Insoluble in Vegetable Oils
5 Total Dye Content Min. 87 %
6 Loss on Drying (at 135°C) & Sodium Chlorides & Sulphates NMT 14.0 %
7 Water Insoluble Matter NMT 0.2 %
8 Combined Ether Extracts NMT 0.2 %
9 Subsidiary Dyes NMT 1.0 %


  • Carmoisine is approved as a food dye (food color) in the European Union (having E number E122) and is used in certain foods such as cheeses and in some alcoholic beverages.
  • It is mostly used in fermented foods that have undergone thermal processing.
  • Also, it is allowed to be used as an excipient in certain pharmaceutical preparations.

Side effects

  • Carmoisine has been reported to induce hypersensitivity reactions in sensitive individuals, including skin swelling, breathing difficulties, and hives.
  • It has also found to trigger intolerance reactions in people intolerant to salicylates (Aspirin).
  • It could aggravate asthma symptoms.


Q. Is Carmoisine safe for humans?

There is no indication that Carmoisine has either mutagenic or carcinogenic characteristics. The FDA has approved it as safe for human consumption within the acceptable daily intake (ADI) of 0–4 mg/kg.

Q. What are the side effects of Carmoisine?

No side effects are reported with use of carmoisine dye. In extremely rare cases, it may induce allergic responses in the skin and the respiratory system.

Q. Is Carmoisine vegan?

Carmoisine is a vegan dye and is used as a food colorant.

Q. Is Carmoisine a dangerous good?

Carmoisine food color is not classified as dangerous in the meaning of transport regulations.


Food Dyes | An overview of all the dyes currently used in Food

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