Neville-Winter Acid

Name:
Neville-Winter Acid
Detailed information:

Chemistry name:	1-naphthol-4-sulfonic acid; α-naphtholsulfonic acid; NW acid
Chemistry structure:
Properties:
Transparent plates. Mp 170C. Soluble in water.
Derivation:
From sodium salt of naphthionic acid by hydrolysis of the amino group.
Use:
Azo dye intermediate, e.g., Congo Corinth.