Description

Pontacyl Carmine 2B is a synthetic, water-soluble red acid dye belonging to the azo chemical class. This high-purity colorant is valued for its strong tinctorial strength and good lightfastness, making it a reliable choice for demanding applications. It is primarily utilized in industries requiring vibrant and stable red coloration, such as textile dyeing, ink formulation, and as a biological stain in laboratory settings. Consistent quality and batch-to-batch uniformity are key attributes for industrial users.

Application

• Textile Dyeing: Used for dyeing natural and synthetic fibers, particularly wool, silk, and nylon, to achieve bright red shades.
• Ink Manufacturing: Serves as a key pigment in the formulation of writing inks, stamp pad inks, and specialty printing inks.
• Biological Staining: Employed in histology and microscopy as a selective stain for cytoplasmic elements and specific tissue components.
• Paper Coloring: Applied in the tinting of specialty papers, including decorative and security papers.
• Leather Industry: Used for dyeing leather goods to produce consistent and vibrant red colors.
• Indicator Chemistry: Can be utilized as a pH indicator or in the preparation of chemical detection reagents.

Basic Information

Product Name	Pontacyl Carmine 2B
CAS No.	6625-46-3
Molecular Formula	C22H14N4Na2O9S2
Molecular Weight	580.48 g/mol
Synonyms	Acid Red 44; C.I. 16250; Azo Rubine S; Carmoisine A; Pontacyl Carmine 2B; Azorubin S; Food Red 3; Lissamine Carmine; Acid Carmine 2B
EINECS	229-581-4

Quality Control

Our Pontacyl Carmine 2B is manufactured under a strict quality management system. Each batch is tested to ensure it meets high-purity standards for color strength, solubility, and impurity profiles. While not typically classified as a pharmaceutical or food grade, our production adheres to consistent industrial specifications. A Certificate of Analysis (COA) detailing assay, identification, and related substance tests is provided with every shipment to guarantee traceability and compliance.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Keep the container tightly sealed when not in use to prevent moisture absorption and contamination.

Specification

Item	Specification
Appearance	Dark red to brown powder
Identification (IR)	Conforms to standard
Assay (HPLC)	Min. 85% (as dye content)
Solubility (in Water)	Completely soluble
Loss on Drying	Max. 5.0%
Sulfated Ash	Max. 20.0%
Heavy Metals (as Pb)	Max. 20 ppm

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