Description

C.I. Mordant Black 8 is a synthetic organic dye belonging to the mordant dye class, widely recognized for its ability to form stable, colored complexes with metal ions. This property is critical for achieving durable and wash-fast coloration on various substrates, particularly natural fibers. It is an essential chemical for industries requiring robust and specific color shades in their dyeing and printing processes. The compound is identified by CAS No. 12224-57-6.

Application

This versatile mordant dye is employed across several industrial sectors for its excellent complexing properties and color fastness.

• Textile Dyeing: Primarily used for dyeing wool, silk, and other protein fibers, often using chromium or aluminum mordants to produce deep, fast black shades.
• Leather Processing: Applied in the coloring of leather goods, where it provides durable and uniform coloration.
• Biological Staining: Utilized in histology and microscopy as a metal-complexing stain for specific tissue components.
• Analytical Chemistry: Serves as a metallochromic indicator in complexometric titrations, particularly for determining ions like calcium and magnesium.
• Ink Formulation: Incorporated into specialty inks where metal-ion interaction and stability are required.
• Paper Coloring: Used in niche paper dyeing applications for specific archival or decorative papers.

Basic Information

Product Name	C.I. Mordant Black 8
CAS No.	12224-57-6
Molecular Formula	C20H12N3NaO7S
Molecular Weight	461.38 g/mol
Synonyms	Eriochrome Black T; Mordant Black 11; Solochrome Black T; Chrome Black ET; Acid Chrome Dark Blue; C.I. 14645; Sodium 1-(1-Hydroxy-2-naphthylazo)-6-nitro-2-naphthol-4-sulfonate; 3-Hydroxy-4-[(2-hydroxy-1-naphthyl)azo]-7-nitro-1-naphthalenesulfonic acid sodium salt
EINECS	235-426-6

Quality Control

Our production of C.I. Mordant Black 8 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, solubility, and metal complexing efficiency. Certificates of Analysis (COA) documenting purity, strength, and conformity to agreed specifications are 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). Keep away from strong oxidizing agents. The material is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Dark brown to black powder
Identification (IR)	Conforms to structure
Dye Content (Assay)	Min. 85%
Moisture Content	Max. 5.0%
Water Solubility	Conforms
Ash Content	Max. 15.0%
Shade & Strength	Against standard

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