Acid Orange 7
# Acid Orange 7

Acid Orange 7, also known as 2-naphthol orange is an azo dye. It is used for dyeing wool.

## Preparation

It is produced by azo coupling of β-naphthol and diazonium derivative of sulfanilic acid.

    $HO_3SC_6H_4N+2$ + $C_{10}H_7OH$ → $HO_3SC_6H_4N=NC_{10}H_6OH$ + $H^+$
