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These products are mainly used for pigments industry.  Such as:  Bon acid, it is Light yellow powder. Melting range 217-223°C. Easily soluble in alcohol, ether. Soluble in benzene, alkali solution. Slightly soluble in water and applied in producing colour Naphthol as and other kinds intermediates of colour naphthol. Moreover, it is intermediates of medicine and organic pigment.  Other Naphthol series, like AS, AS-D are mainly used for organic pigments.