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Acid Red 52 Chemical Structure

What is Acid Red 52?

Acid Red 52 is a synthetic dye, chemically an organic sodium salt having 4-[3,6-bis(diethylamino)xanthenium-9-yl]benzene-1,3-disulfonate as the counterion. It is a water soluble acid dye commonly used in textile and cosmetic industries.

Macsen Laboratories is the leading manufacturer and supplier of Acid Red 52 with ISO certification.
Name of Product Acid Red 52
IUPAC Name sodium;4-[3-(diethylamino)-6-diethylazaniumylidenexanthen-9-yl]benzene-1,3-disulfonate
Synonyms C.I. Acid Red 52; Acid Rhodamine B; Lissamine Rhodamine; Sulforhodamine B sodium salt; Xylene Red B; Amido Rhodamine B; Acid Red XB; Food Red 106
CAS No 3520-42-1
Molecular Formula C27H29N2NaO7S2
Molecular Weight 580.7 g/mol
Pubchem CID 9916275


SR. No Criteria Limit/Specification
1 Appearance (Form) Solid Powder
2 Appearance (Color) Pink to Dark Red to Reddish Brown
3 Solubility Up to 7.5% in water
Up to 3% in saline
Up to 1% in DMSO
4 Moisture Content (at 135°C) NMT 1%
5 Chloride Content (1% Sol.) 57 ppm as NaCl
6 Sulphate Content (1% Sol.) 110 ppm as Na2SO4
7 Dye Strength 96.2%


Acid Red 52 dye finds various uses in textile, food, and cosmetic industries. Some of the common uses are as follows-

  • It is used to dye natural and synthetic fibers, such as wool, silk, and nylon. The dye is applied in an acidic solution, which helps the dye molecules bond to the fibers.
  • In laboratories, Acid Red 52 can be used for biological staining applications, such as in histology and microbiology, to color cells and tissues for microscopic examination.
  • It may also be used as a cosmetic colorant in cosmetics, including lipsticks, blushes, and nail polish, to achieve shades of red or pink.
  • It is used up to a concentration of 1.5% on-head, in oxidative hair dye formulations and up to 0.6 % in non-oxidative hair dye-formulation.

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