3-Hydroxy-2-naphthoic acid can be used as a pharmaceutical intermediate.
3-Hydroxy-2-naphthoic acid is coupled with diazo compounds and their calcium salts are bright red bleed resistance pigments. The somewhat higher cost manganese salt shows better exterior durability than the calcium or barium salts. The 3-hydroxy-2-naphthoic acid red pigments are characterized by an extremely high degree of color stability, resistance to acids and alkalies and are nontoxic.
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