Description

C.I. Acid Brown 104 is a synthetic acid dye belonging to the azo dye class, identified by CAS No. 61724-10-5. This high-performance dye is valued for its strong affinity to protein fibers, delivering consistent and durable coloration. It is primarily used in the textile industry for dyeing wool, silk, and nylon, as well as in leather finishing and specialty paper applications where robust, lightfast brown shades are required.

Application

• Primary dyeing of wool and wool-blend textiles.
• Coloration of silk fabrics and yarns.
• Dyeing of nylon fibers for carpets, apparel, and industrial fabrics.
• Leather finishing for footwear, upholstery, and accessories.
• Specialty paper coloring for decorative and packaging applications.
• Ink formulation for specific marking and printing uses.
• Historical or restoration dyeing processes for textiles.

Basic Information

Product Name	C.I. Acid Brown 104
CAS No.	61724-10-5
Molecular Formula	C32H24N8Na2O8S2
Molecular Weight	758.68 g/mol
Synonyms	Acid Brown 104; Acid Leather Brown PR; C.I. 20170; Acid Fast Brown BRL; Amido Brown BRL; Dermacid Brown BRL; Lanasyn Brown BRL; Nylosan Brown E-RBL; Supranol Fast Brown BRL; Tectilon Brown 3R
EINECS	262-964-5

Quality Control

Our production of C.I. Acid Brown 104 adheres to stringent quality management protocols to ensure batch-to-batch consistency and performance reliability. Each lot is tested against key parameters including dye content, shade strength, solubility, and fastness properties. Certificates of Analysis (COA) documenting these results are provided with every shipment to support your quality assurance processes.

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 and sources of ignition. Under these conditions, the product remains stable for extended periods.

Specification

Item	Specification
Appearance	Brown powder or granules
Identification (IR)	Conforms to standard
Dye Content	≥ 95% (Typical)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Shade	Conforms to standard pattern
Solubility in Water	Freely soluble
pH (1% Solution)	6.0 - 8.0

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