2503-73-3 Usage
Description
Direct Blue 78 is a water-soluble dye with a blue color, exhibiting good solubility in water at varying temperatures and slightly soluble in alcohol. It is insoluble in other organic solvents and demonstrates color changes when interacting with different chemicals, such as strong sulfuric acid, nitric acid, and strong hydrochloric acid. The dye maintains its color lightness in the presence of copper and iron ions and is classified as Class B by the SDC. It shows excellent neutral white and alkaline white properties.
Uses
Used in Textile Industry:
Direct Blue 78 is used as a dye for cotton or viscose materials in direct dyeing and printing processes. It is also used in combination with disperse dyes for bath dyeing of polyester/cotton blended fabrics.
Used in Paper Industry:
Direct Blue 78 is used as a dye for paper, providing coloration and enhancing the appearance of the paper products.
Used in Leather Industry:
Direct Blue 78 is used as a dye in the leather industry, contributing to the coloration and aesthetic appeal of leather goods.
Used in Biological Applications:
Direct Blue 78 can be used for dyeing in biological applications, such as staining and visualization in research and diagnostic settings.
Standard:
The performance standards for Direct Blue 78 in terms of acid resistance, alkali resistance, light fastness, soaping, water, and staining are as follows:
Acid Resistance: ISO 4, AATCC 5
Alkali Resistance: ISO 4-5, AATCC 4-5
Light Fastness: ISO 4-5, AATCC 5
Soaping: ISO 2-3, AATCC 3
Water Fading: ISO 2-3, AATCC 3
Stain Fading: N/A
Stain: N/A
Preparation
2-Aminobenzene-1,4-disulfonic acid diazo, and 8-Aminonaphthalene-2-sulfonic acid first coupling, its product to diazo, and Naphthalen-1-amine second coupling, again diazo, in alkaline conditions and 4-Hydroxy-7-(phenylamino)naphthalene-2-sulfonic acid third coupling.
Flammability and Explosibility
Notclassified
Standard
Acid Resistance
Fading
Stain
ISO
4
AATCC
5
Check Digit Verification of cas no
The CAS Registry Mumber 2503-73-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,5,0 and 3 respectively; the second part has 2 digits, 7 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 2503-73:
(6*2)+(5*5)+(4*0)+(3*3)+(2*7)+(1*3)=63
63 % 10 = 3
So 2503-73-3 is a valid CAS Registry Number.
InChI:InChI=1/C42H29N7O13S4.4Na/c50-42-29-13-10-26(43-25-6-2-1-3-7-25)20-24(29)21-40(66(60,61)62)41(42)49-47-35-16-15-34(30-8-4-5-9-31(30)35)44-46-37-18-17-36(32-14-11-27(22-33(32)37)63(51,52)53)45-48-38-23-28(64(54,55)56)12-19-39(38)65(57,58)59;;;;/h1-23,43,50H,(H,51,52,53)(H,54,55,56)(H,57,58,59)(H,60,61,62);;;;/q;4*+1/p-4
