Description

Tetrabromofluorescein Potassium Salt is a high-purity, water-soluble xanthene dye derivative, valued for its intense red fluorescence and strong chromogenic properties. This compound is critical for applications requiring a sensitive and stable colorimetric or fluorescent indicator. It is primarily utilized by manufacturers and research laboratories in the analytical chemistry, biological staining, and specialty ink sectors. Our supply ensures consistent quality and reliable performance for your most demanding formulations.

Application

• Biological Staining: Used as a fluorescent tracer and counterstain in microscopy and histology.
• Analytical Chemistry: Serves as a sensitive adsorption indicator for argentometric titrations (e.g., Mohr's method for chloride).
• Dye & Pigment Intermediate: Acts as a key precursor for synthesizing other brominated fluorescein dyes and lake pigments.
• Laser Dye & Optical Applications: Employed in the formulation of tunable dye lasers and optical sensors due to its fluorescence properties.
• Diagnostic Reagents: Utilized in the development of test strips and diagnostic kits as a color-changing agent.
• Specialty Inks: Incorporated into security inks and high-visibility marking fluids.

Basic Information

Product Name	Tetrabromofluorescein Potassium Salt
CAS No.	56897-54-2
Molecular Formula	C20H8Br4K2O5
Molecular Weight	760.09 g/mol
Synonyms	Eosin Y, Potassium Salt; Eosine Y; Acid Red 87; C.I. 45380; Bromoeosine; 2',4',5',7'-Tetrabromofluorescein Dipotassium Salt; Eosin Yellowish; Tetrabromofluorescein Dipotassium
EINECS	Contact for details

Quality Control

Every batch of our Tetrabromofluorescein Potassium Salt is manufactured under a strict quality management system. We perform comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure the product meets exacting standards for critical applications. Certificates of Analysis (COA) documenting lot-specific results are available upon request to support your quality assurance and regulatory needs.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Red to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Water Solubility	Freely soluble
Fluorescence	Characteristic red emission

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