Description

Chromotrope 2B is a synthetic azo dye widely recognized for its use as a biological stain and pH indicator. Its value lies in its specific colorimetric properties, which provide reliable and consistent results in analytical and histological procedures. This product is essential for laboratories and manufacturers in the life sciences, textile, and analytical chemistry sectors, where precise color development and staining are critical for quality control and research. Chromotrope 2B CAS NO 548-80-1 is a key reagent for professionals requiring dependable diagnostic and staining materials.

Application

• Histological Staining: Used as a specific stain for connective tissues, cartilage, and cytoplasmic granules in biological samples for microscopic examination.
• pH Indicator: Serves as a colorimetric pH indicator in analytical chemistry and titration experiments due to its distinct color change within a specific pH range.
• Textile Dyeing: Employed in the dyeing of protein fibers like wool and silk, as well as for coloring leather, leveraging its affinity for these materials.
• Biological Research: Utilized in various laboratory protocols for staining microorganisms and specific cellular components to aid in identification and study.
• Ink Formulation: Acts as a colorant in the production of specialized inks for industrial or laboratory marking purposes.
• Diagnostic Reagents: A component in the formulation of certain clinical and diagnostic test kits that rely on color development.

Basic Information

Product Name	Chromotrope 2B
CAS No.	548-80-1
Molecular Formula	C16H10N2Na2O8S2
Molecular Weight	468.37 g/mol
Synonyms	Acid Red 176; C.I. 16575; Chromotrope 2R; Wool Fast Blue BL; Eriochrome Blue SE; Chromotrope FB; Mordant Blue 79; Acid Leather Blue B; 4,5-Dihydroxy-3-[(4-sulfo-1-naphthyl)azo]-2,7-naphthalenedisulfonic acid trisodium salt
EINECS	208-963-1

Quality Control

Our Chromotrope 2B is produced and tested under a stringent quality management system to ensure batch-to-batch consistency and reliability. Each lot undergoes comprehensive analysis, including identity confirmation, purity assay, and impurity profiling. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to support your quality assurance protocols and regulatory compliance 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). Keep away from incompatible materials. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Dark brown to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 85% (Dye content)
Loss on Drying	≤ 5.0 %
Water Solubility	Freely soluble
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm

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