
8-Hydroxyquinoline sulfate is the sulfate salt of 8-hydroxyquinoline, appearing as a light yellow crystalline powder with markedly improved water solubility compared with the free base. It retains the chelating and antimicrobial properties of oxine, and is widely used as a fungicide, preservative and analytical reagent. in water. In acidic solutions, it is colorless, while in basic solutions, it turns pink to purple.