Description

Acid Mordant Black 7 is a synthetic azo dye belonging to the mordant dye class, widely recognized for its excellent complexing properties with metal ions. This compound is valued for its ability to produce deep, wash-fast shades on various substrates, particularly in applications requiring high color stability. It serves as a critical component for industrial dyers and manufacturers in the textile, leather, and specialty paper industries seeking durable coloration.

Application

• Textile Dyeing: Primarily used for dyeing wool, silk, and nylon, where it forms stable complexes with chromium or other metal mordants to achieve deep black and grey shades with superior light and wash fastness.
• Leather Finishing: Employed in the dyeing of leather goods, providing rich, penetrating color that is resistant to rubbing and perspiration.
• Paper Staining: Used for the coloration of specialty papers, including decorative and security papers, where color consistency and stability are paramount.
• Biological Staining (Histology): In laboratory settings, it can be utilized as a staining agent for microscopic tissue analysis, often in combination with other dyes.
• Wood Staining: Applied for coloring wood and wood-based products, offering good penetration and UV resistance.
• Ink Formulation: A component in the manufacture of certain inks, particularly where metal-complex stability is beneficial for print durability.

Basic Information

Product Name	Acid Mordant Black 7
CAS No.	3618-60-8
Molecular Formula	C20H13N4NaO5S
Molecular Weight	460.39 g/mol
Synonyms	Acid Chrome Black 7; Acid Chrome Black T; C.I. Mordant Black 7; Chrome Black T; Eriochrome Black T; Mordant Black 7; Solochrome Black T; C.I. 14640; Sodium 4-[(1-hydroxy-2-naphthyl)azo]-3-nitrobenzenesulfonate
EINECS	222-818-7

Quality Control

Our Acid Mordant Black 7 is manufactured under a stringent quality management system. Every batch is tested to ensure it meets precise specifications for color strength, purity, and metal content relevant to its dyeing performance. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical properties is provided with each shipment to guarantee batch-to-batch consistency and compliance with industry standards.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Dark brown to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
Ash Content	≤ 1.0%
Heavy Metals (as Pb)	≤ 20 ppm

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