Description

C.I.Direct Red 83 is a high-performance, substantive azo dye widely used for its excellent tinctorial strength and good fastness properties. This product is essential for achieving vibrant, durable red shades on cellulosic fibers like cotton and viscose in direct dyeing processes. It is a critical component for textile manufacturers, paper colorants, and leather tanneries requiring consistent, high-quality coloration.

Application

• Textile Dyeing: Primary application for dyeing cotton, viscose, and other cellulosic fibers to a bright red shade.
• Paper Coloring: Used in the production of colored papers, tissues, and paperboard where good bleed resistance is required.
• Leather Finishing: Imparts color to leather goods, including footwear, bags, and upholstery.
• Ink Formulation: A pigment source for certain types of inks, including flexographic and packaging inks.
• Biological Staining: Potential use as a histological stain in laboratory settings for microscopic analysis.
• Craft and Specialty Dyes: Employed in artisan crafts and for educational purposes in dye chemistry.

Basic Information

Product Name	C.I. Direct Red 83
CAS No.	2609-99-6
Molecular Formula	C29H19N5Na2O8S2
Molecular Weight	675.60 g/mol
Synonyms	Direct Red 83; C.I. 29225; Benzo Scarlet 4BS; Direct Scarlet 4BS; Pontamine Scarlet 4BS; Sirius Scarlet 4BS; Chlorazol Scarlet 4BS; Direct Fast Scarlet 4BS; Direct Red 4B
EINECS	220-017-5

Quality Control

Our C.I. Direct Red 83 is manufactured under a stringent quality management system to ensure batch-to-batch consistency and performance. Each lot is tested against established specifications for color strength, shade, solubility, and impurity profiles. A Certificate of Analysis (COA) detailing purity, physical properties, and conformance is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Red to dark red powder
Identification (IR)	Conforms to standard
Color Strength	100 ± 3% (vs. Standard)
Shade	Conforms to standard
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
pH (1% Solution)	6.0 - 8.0
Fastness Properties	To light, washing, and perspiration as per industry standards

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