Description

Indigosol O, Disodium Salt is a specialized, water-soluble derivative of indigo, designed for high-performance dyeing applications. This compound matters for its ability to produce the classic, fast indigo blue color with superior leveling properties and ease of application in modern industrial processes. It is primarily needed by manufacturers in the textile industry for dyeing cotton, wool, and silk, as well as by producers of inks and specialty coatings.

Application

• Textile Dyeing: Primary application for dyeing natural fibers like cotton, wool, and silk to achieve a fast indigo blue shade.
• Ink Manufacturing: Used as a colorant in the formulation of specialty inks for packaging and security printing.
• Leather Processing: Employed in the dyeing of leather goods to provide consistent and durable coloration.
• Paper Coloration: Suitable for tinting specialty papers and cardboards.
• Research & Development: Serves as a chemical intermediate or reference standard in synthetic chemistry and analytical laboratories.
• Industrial Coatings: Can be incorporated into coatings where a specific blue pigment is required.

Basic Information

Product Name	Indigosol O, Disodium Salt
CAS No.	3875-70-5
Molecular Formula	C16H8N2Na2O8S2
Molecular Weight	466.35 g/mol
Synonyms	Indigosol O; Solubilised Indigo O; Sodium 5,5'-indigotindisulfonate; Indigo Carmine, Soluble; C.I. 73015; C.I. Vat Blue 1, solubilized; Acid Blue 74 (related); FD&C Blue No. 2 (related form)
EINECS	223-393-1

Quality Control

Our Indigosol O, Disodium Salt is produced under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, color strength, and solubility. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical properties is available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	Blue to bluish-gray powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Solubility (in Water)	Clear, complete solution
Loss on Drying	≤ 5.0%
Sulfated Ash	≤ 20.0%
Heavy Metals (as Pb)	≤ 20 ppm

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