Description

Rose Bengal is a synthetic, water-soluble xanthene dye widely recognized for its vibrant pink to red color and unique photochemical properties. Its primary commercial value lies in its dual functionality as a vital biological stain for diagnostic applications and a highly effective photosensitizer in advanced oxidation processes. This compound is essential for manufacturers and research institutions in the pharmaceutical, diagnostic, environmental technology, and textile industries seeking reliable, high-purity colorants and reactive agents.

Application

• Diagnostic Staining: A key component in ophthalmic solutions for staining damaged corneal and conjunctival cells (Bengal Rose test) and as a vital stain in microbiology.
• Photosensitizer & Photodynamic Therapy (PDT): Used in research for antimicrobial applications and experimental cancer therapies due to its ability to generate reactive oxygen species upon light activation.
• Industrial Dye: Employed as a colorant for inks, paper, and textiles, valued for its bright hue and solubility.
• Environmental Research: Acts as a tracer in hydrological studies and a model compound in photocatalytic water treatment research.
• Food Industry (Discontinued/Historical): Previously used as a food colorant (E127), now primarily of historical and reference significance.
• Research Reagent: Utilized in various laboratory protocols for staining biological tissues, cell viability assays, and photochemistry experiments.

Basic Information

Product Name	Rose Bengal
CAS No.	632-68-8
Molecular Formula	C20H2Cl4I4Na2O5
Molecular Weight	1017.64 g/mol
Synonyms	Acid Red 94; C.I. 45440; Bengal Rose B; Rose Bengal Sodium Salt; 4,5,6,7-Tetrachloro-2',4',5',7'-tetraiodofluorescein disodium salt; Phloxine B Toner; E127; Food Red 105
EINECS	211-183-3

Quality Control

Our Rose Bengal is produced under a strict quality management system to ensure batch-to-batch consistency and reliability. We offer grades suitable for industrial, technical, and research applications, with key parameters including color strength, purity (assay), and heavy metal content routinely verified. A comprehensive Certificate of Analysis (COA) detailing identity, purity, and specific impurity profiles is provided with each shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from incompatible materials. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain product integrity.

Specification

Item	Specification
Appearance	Dark Pink to Red Powder
Identification (IR)	Conforms to Standard
Assay (HPLC)	≥ 85% (Dye Content)
Loss on Drying	≤ 10.0 %
Water Solubility	Freely Soluble
Heavy Metals (as Pb)	≤ 20 ppm
pH (1% Solution)	6.5 - 8.5

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.