J acid¡ê¡§2-amino-5-naphthol-7-sulfonic acid¡ê© y itself when in the sodium carbonate solution. Usage: j acid is one of the important dyestuff intermediates. It is used for production many dyes as the material, such as direct copper blue 151, direct scarlet 23, reactive brown k3r, carbonyl-j-acid and bis-j-acid etc. On 100% industrial basis
