Description

Chlorophenol Blue is a high-purity triphenylmethane dye widely used as a sensitive pH indicator and biological stain. Its distinct color transition across a critical pH range makes it an essential tool for analytical chemistry and life science research. This product is primarily utilized by manufacturers and research laboratories in the chemical, pharmaceutical, and biotechnology sectors for precise endpoint detection and histological applications.

Application

• pH Indicator: Used in analytical chemistry for titrations and pH testing strips due to its clear color change from yellow (pH 3.0) to violet-blue (pH 4.8).
• Biological Staining: Serves as a vital stain in microscopy for visualizing cellular and tissue structures in histology and cytology.
• Research & Development: Employed in biochemical assays and laboratory experiments as a colorimetric reagent for detecting pH changes.
• Educational Kits: A key component in chemistry and biology educational kits for demonstrating acid-base reactions and indicator properties.
• Industrial Process Control: Can be used as a visual endpoint indicator in certain chemical manufacturing processes.

Basic Information

Product Name	Chlorophenol Blue
CAS No.	4430-21-1
Molecular Formula	C19H12Cl2O5S
Molecular Weight	423.27 g/mol
Synonyms	3',3'',5',5''-Tetrachlorophenolsulfonephthalein; 4,4'-(3H-2,1-Benzoxathiol-3-ylidene)bis[2,6-dichlorophenol] S,S-Dioxide; Chlorphenol Blue; Durafur Black R; Tetrachlorophenol Blue; NSC 403697; C.I. 51010; Acid Blue 104
EINECS	224-620-1

Quality Control

Our Chlorophenol Blue is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including identification (IR), assay (HPLC), and impurity profiling, to ensure it meets the high standards required for research and industrial applications. A Certificate of Analysis (COA) detailing purity, physical properties, and test results is provided with every shipment.

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 heat and incompatible materials. This product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Dark green to brownish-green powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
pH Transition Range	3.0 (yellow) to 4.8 (violet-blue)
Loss on Drying	≤ 2.0 %
Residue on Ignition	≤ 0.5 %

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