Naphthol Black B, also known as C.I. Direct Black 38, is a black azo dye derived from naphthalene, a type of coal tar. It is widely used in the textile industry for dyeing cotton, wool, silk, and nylon, as well as in printing inks and paper. The chemical structure of Naphthol Black B consists of two naphthol groups connected by an azo group, which gives it its characteristic black color. It is known for its high tinctorial strength, meaning it can produce a deep color with a small amount of dye, and its good fastness properties, which make it resistant to washing and light. However, it is important to note that some azo dyes, including Naphthol Black B, can potentially release harmful aromatic amines when broken down, which has led to concerns about their environmental and health impacts. As a result, there are ongoing efforts to develop safer alternatives or improve the safety profile of such dyes.

735-19-3

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Basic information
1. Product Name: NAPHTHOLBLACKB
2. Synonyms: NAPHTHOLBLACKB
3. CAS NO:735-19-3
4. Molecular Formula: C15H12N2O3
5. Molecular Weight: 268.27
6. EINECS: N/A
7. Product Categories: N/A
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: NAPHTHOLBLACKB(CAS DataBase Reference)
10. NIST Chemistry Reference: NAPHTHOLBLACKB(735-19-3)
11. EPA Substance Registry System: NAPHTHOLBLACKB(735-19-3)
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: 735-19-3(Hazardous Substances Data)

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Check Digit Verification of cas no

The CAS Registry Mumber 735-19-3 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 7,3 and 5 respectively; the second part has 2 digits, 1 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 735-19:
(5*7)+(4*3)+(3*5)+(2*1)+(1*9)=73
73 % 10 = 3
So 735-19-3 is a valid CAS Registry Number.

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