Description

Indigo Carmine, also known as Acid Blue 74, is a synthetic, water-soluble blue dye belonging to the indigoid class. This high-purity colorant is valued for its intense blue hue and stability in various formulations, making it a critical component for quality control and visual enhancement. It serves a vital role across the pharmaceutical, food, and diagnostic industries where precise coloration and safety are paramount. Global manufacturers and R&D facilities rely on our consistent supply of Indigo Carmine CAS NO 860-22-0 for its performance and compliance with stringent international standards.

Application

• Pharmaceutical Tablet Coating: Used as a colorant in the film coating of tablets and capsules for brand identification and patient compliance.
• Diagnostic Reagents: Serves as a vital stain and indicator in medical diagnostic kits and biological staining procedures.
• Food Coloring (where approved): Imparts a stable blue color to candies, beverages, and other food products, subject to local regulatory approvals.
• Microbiological Staining: Employed in laboratory settings for staining cellular structures to enhance visibility under microscopy.
• Textile Dyeing: Acts as a colorant for dyeing silk, wool, and other specialty fabrics.
• Ink Formulation: Used in the production of specialty inks for printing and writing instruments.
• Analytical Chemistry: Functions as a redox indicator in titrations and other analytical methods.
• Cosmetic Products: Provides coloration in soaps, shampoos, and other personal care items where a blue shade is desired.

Basic Information

Product Name	Indigo Carmine
CAS No.	860-22-0
Molecular Formula	C16H8N2Na2O8S2
Molecular Weight	466.36 g/mol
Synonyms	Acid Blue 74; FD&C Blue No. 2; Food Blue 1; Indigotine; Indigotindisulfonate Sodium; Sodium Indigotindisulfonate; E132; C.I. 73015; Certiqual® Blue
EINECS	212-728-8

Quality Control

Our Indigo Carmine is manufactured under a strict quality management system to ensure batch-to-batch consistency and reliability. The product is tested to meet relevant specifications for pharmaceutical (e.g., USP-NF), food (e.g., FCC), and industrial grades. Comprehensive testing includes identification, assay (purity), loss on drying, and heavy metal analysis. A detailed Certificate of Analysis (COA) is provided with each shipment to guarantee compliance with your specific requirements.

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). The product is hygroscopic (moisture-sensitive); ensure the container is kept tightly sealed when not in use to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Blue to dark blue powder or granules
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 85.0%
Loss on Drying	≤ 15.0 %
Water-insoluble matter	≤ 0.5 %
Heavy Metals (as Pb)	≤ 20 ppm
Arsenic (As)	≤ 3 ppm
Subsidiary Colors	Passes test
Ether-extractable matter	≤ 0.4 %

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