Direct Black M and Tardirect Black M are both azo dyes used in the textile industry for dyeing cotton, wool, silk, and nylon. Direct Black M, also known as C.I. Direct Black 38, is a black dye with a high color yield and good fastness properties. Tardirect Black M, on the other hand, is a more recent development and is known for its improved solubility and compatibility with various dyeing processes. Both dyes are widely used in the production of black textiles, offering a range of shades and depths of color. However, it is important to note that the use of azo dyes has been a subject of environmental and health concerns due to the potential release of harmful aromatic amines during the dyeing process or through the breakdown of the dye over time. As a result, there has been a push towards developing safer alternatives or improving the safety profiles of existing dyes.

6897-38-7

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Basic information
1. Product Name: Direct Black M,Tardirect Black M
2. Synonyms: C.I.Direct Black 150;Direct Black M,Tardirect Black M;6-Amino-3-[[4-[[4-[[7-[(2,4-diaminophenyl)azo]-1-hydroxy-3-sodiosulfo-2-naphthalenyl]azo]-2-sodiosulfophenyl]amino]phenyl]azo]-4-hydroxynaphthalene-2-sulfonic acid sodium salt;C.I.32010;Halfwool Black M
3. CAS NO:6897-38-7
4. Molecular Formula: C38H27N10Na3O11S3
5. Molecular Weight: 964.84569
6. EINECS: N/A
7. Product Categories: N/A
8. Mol File: 6897-38-7.mol
Chemical Properties
1. Melting Point: N/A
2. Boiling Point: N/A
3. Flash Point: N/A
4. Appearance: /
5. Density: N/A
6. Refractive Index: N/A
7. Storage Temp.: N/A
8. Solubility: N/A
9. CAS DataBase Reference: Direct Black M,Tardirect Black M(CAS DataBase Reference)
10. NIST Chemistry Reference: Direct Black M,Tardirect Black M(6897-38-7)
11. EPA Substance Registry System: Direct Black M,Tardirect Black M(6897-38-7)
Safety Data
1. Hazard Codes: N/A
2. Statements: N/A
3. Safety Statements: N/A
4. WGK Germany:
5. RTECS:
6. HazardClass: N/A
7. PackingGroup: N/A
8. Hazardous Substances Data: 6897-38-7(Hazardous Substances Data)

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Check Digit Verification of cas no

The CAS Registry Mumber 6897-38-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,8,9 and 7 respectively; the second part has 2 digits, 3 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 6897-38:
(6*6)+(5*8)+(4*9)+(3*7)+(2*3)+(1*8)=147
147 % 10 = 7
So 6897-38-7 is a valid CAS Registry Number.

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