Description

Acid Red 361 is a synthetic organic dye belonging to the azo dye class, valued for its vibrant red hue and good fastness properties. This colorant is engineered for demanding applications where consistent shade, solubility, and stability are critical for product quality. It serves as an essential component for manufacturers in the textile, leather, and specialty ink industries seeking reliable and high-performance red dyes.

Application

The primary use of Acid Red 361 is as a coloring agent in various industrial processes. Its specific applications include:

• Textile Dyeing: For dyeing polyamide (nylon) and protein fibers (wool, silk), providing excellent levelness and wash fastness.
• Leather Finishing: Used in the coloration of leather goods, offering rich and uniform color penetration.
• Ink Manufacturing: A key pigment for creating specialty inks, including those for ballpoint pens and stamp pads.
• Paper Staining: Employed for tinting paper products where a specific red shade is required.
• Biological Staining: Potential use as a microscopic stain in histology and cytology laboratories.
• Plastics and Polymers: For mass coloration of certain plastics where compatibility is achieved.

Basic Information

Product Name	Acid Red 361
CAS No.	61931-22-4
Molecular Formula	C32H21N5Na2O8S2
Molecular Weight	729.64 g/mol
Synonyms	Acid Red 361; C.I. 18130; Acid Leather Red G; Nylosan Red F-3GL; Telon Red F3GL; Amacid Red G; Derma Red G; Lissamine Red G; Supranol Red GW; Acid Fast Red G; 2,7-Naphthalenedisulfonic acid, 5-[[4-chloro-2-[(2-hydroxy-1-naphthalenyl)azo]phenyl]azo]-4-hydroxy-3-[(4-methylphenyl)azo]-, disodium salt
EINECS	Contact for details

Quality Control

Our Acid Red 361 is produced under a strict quality management system. Each batch undergoes rigorous testing for key parameters including color strength, shade, solubility, and impurity profile to ensure it meets consistent performance standards. A comprehensive 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). This product is hygroscopic (moisture-sensitive); the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Red to dark red powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Solubility	Clear solution at 1%
pH (1% Solution)	6.0 - 8.0
Ash Content	≤ 1.0%

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