Appearance:Black Powder Manufacturing Methods:
3,5-Diamino-4-hydroxybenzenesulfonic acid double nitrogen, add Sodium hydroxide make show weak alkaline, in order to make molecules of chlorine is hydroxyl replaced, then first and 6-Hydroxynaphthalene-2-sulfonic acid coupling, again with Naphthalen-2-ol coupling. Description About Mordant Black 25:
Soluble in water for purple to Copenhagen blue, slightly soluble in ethanol for dark purple, not soluble in Acetone. In concentrated sulfuric acid to deep purple, dilution after brown light orange. Dye aqueous solution to join concentrated hydrochloric acid to brown light orange, Join concentrated sodium hydroxide solution for purple.This product is used for biological Stains.