... Amino-4-hydroxynaphtalene-2-sulfonic acid Content : 99%min Nature : the goods for white or light gray irregular crystals. Hard soluble ... sediments, water-soluble sodium blue fluorescence. Purposes : the goods for the dye intermediates, used in the manufacture of dyes, such as direct Qinglian ... , green and reddish brown dye, etc., can be used in the manufacture of Scarlet acid and J phenyl acid. J Acid