Rose bengal

CAS Number:  632-69-9
Molecular Weight: 1017.64
MDL number: MFCD00005043
EC Index Number: 211-183-3

General description

  • Rose Bengal is a red or rose color dye and is anionic in nature. It is a 4,5,6,7-tetrachloro 2′,4′,5′,7′-tetraiodo derivative of fluorescein. It is widely used to detect damage to the ocular surface epithelium in ocular surface diseases such as dry eye and herpetic keratitis. Rose Bengal has mild antiviral potency.[1][2]
  • Rose Bengal is used to stain dead and degenerating cells and mucus.[3]


Rose Bengal has been used to evaluate acrosome integrity.[4][5] It has also been used to initiate photothrombotic occlusion in blood.[6][7]

form solid
Quality Level 200
composition Dye content, 95%
λmax 549 nm
application(s) diagnostic assay manufacturing



storage temp. room temp
SMILES string [Na+].[Na+].[O-]C(=O)c1c(Cl)c(Cl)c(Cl)c(Cl)c1C2=C3C=C(I)C(=O)C(I)=C3Oc4c(I)c([O-])c(I)cc24
SMILES string S=C(NNc1ccccc1)\N=N\c2ccccc2
InChI 1S/C20H4Cl4I4O5.2Na/c21-10-8(9(20(31)32)11(22)13(24)12(10)23)7-3-1-5(25)16(29)14(27)18(3)33-19-4(7)2-6(26)17(30)15(19)28;;/h1-2,29H,(H,31,32);;/q;2*+1/p-2