OIL YELLOW OB

CAS NO.：131-79-3
Empirical Formula: C17H15N3
Molecular Weight: 261.32
MDL number: MFCD00046381
EINECS: 205-039-9
SAFETY DATA SHEET (SDS)
Update Date: 2026-04-10 10:27:33

What is OIL YELLOW OB?

Chemical properties

Orange or yellow powder. Insoluble in water; soluble in alcohol and oils.

The Uses of OIL YELLOW OB

Biological stain.

Preparation

O-Methylaniline diazotization, and Naphthalen-2-amine coupling.

Definition

ChEBI: Yellow OB is a member of azobenzenes.

Hazard

Consult regulations before using in food products. Questionable carcinogen.

Safety Profile

A poison by ingestion. Moderately toxic by intraperitoneal and subcutaneous routes. Questionable carcinogen with experimental tumorigenic data. May be contaminated with the carcinogen p-naphthylamine. Mutation data reported. When heated to decomposition it emits toxic fumes of NOx. See also AROMATIC AMINES.

Properties and Applications

red light yellow to orange (in mineral oil). Soluble in ethanol and Toluene, insoluble in water. In the crystallization of from ethanol to get is a deep red, melting point is 126 ℃. In concentrated sulfuric acid to red light purple, after diluted solution for red, orange brown precipitation. Dye alcohol solution to join hydrochloric acid solution more red; Sodium hydroxide and the same color.

Standard	Light Fastness	Heat-resistant(℃)		water	Sodium Carbonate(5%)	Hydrochloric acid(5%)
		Melting point	Stable
ISO	Good	126	70	Insoluble	Well	Well

Properties of OIL YELLOW OB

Melting point:	125-126° (Fischer)
Boiling point:	394.58°C (rough estimate)
Density	1.1394 (rough estimate)
refractive index	1.6360 (estimate)
IARC	3 (Vol. 8, Sup 7) 1987
EPA Substance Registry System	C.I. Solvent Yellow 6 (131-79-3)