Description

Eosin Ii CAS NO 6441-80-1 is a synthetic xanthene dye belonging to the eosin family, widely recognized for its distinctive pink-red color and strong fluorescence. This high-purity compound is critical for applications requiring precise staining and detection, offering excellent batch-to-batch consistency for reliable results. It is an essential reagent for research, diagnostic, and quality control laboratories in the life sciences, histology, and industrial sectors.

Application

• Histological Staining: A key component in H&E (Hematoxylin and Eosin) staining for visualizing cytoplasmic structures, collagen, and muscle fibers in tissue samples.
• Cytology and Blood Smears: Used for staining blood cells and other cytological preparations to differentiate cell types and identify abnormalities.
• Fluorescence Microscopy & Assays: Employed as a fluorescent counterstain or tracer in fluorescence-based biological imaging and diagnostic kits.
• Ink & Dye Manufacturing: Serves as a colorant for inks, including red inks, and in the production of other dyes and pigments.
• Quality Control in Pharmaceuticals: Used as a staining agent in certain pharmacopoeial tests and for quality assessment of other materials.
• Forensic Science: Applied in latent fingerprint development and other forensic detection techniques.

Basic Information

Product Name	Eosin Ii
CAS No.	6441-80-1
Molecular Formula	C20H6Br4Na2O5
Molecular Weight	691.86 g/mol
Synonyms	Eosin Y, Eosin Yellowish, Acid Red 87, C.I. 45380, Bromoeosin, Eosin Water Soluble, Eosin Disodium Salt, 2',4',5',7'-Tetrabromofluorescein Disodium Salt
EINECS	229-233-4

Quality Control

Our Eosin Ii is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including identification, purity assay, and impurity profiling, to ensure it meets the high standards required for laboratory and diagnostic use. Certificates of Analysis (COA) detailing all test results are provided to guarantee traceability and compliance with your specifications.

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.

Specification

Item	Specification
Appearance	Red to brown-red powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 85.0% (as dye content)
Loss on Drying	≤ 10.0 %
Water Solubility	Clear, red solution
Absorbance (λ max)	517 - 521 nm
pH (1% Solution)	7.0 - 9.0

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