Sodium naphthalene sulfonate is light yellow to yellow-brown powder, an anionic surfactant. sodium naphthalene sulfonate is soluble in water, acid, alkali and hard water, good dispersion properties. With protein and polyamide fibers have affinity. Mainly used to coloring for vat dyes, reactive dyes, acid dyes, acid staining pad or pigment pad dyeing of the dispersing agent, as a auxiliaries for vat dyess powder or sizing agent. Also used staining to levelling agent and auxiliary tanning agent in leather industry.