6- Hydroxynaphthalene-2- Sulfonic Acid is accessible in white or gray yellow powder form. Melting point of this reactive dye intermediate is more than 300 degree C and its refractive index is 1.703. This powder based substance is offered in 98% pure form. Density of 6- Hydroxynaphthalene-2- Sulfonic Acid is 1.549 g/cm3. Standard of this chemical has been verified on the basis of its purity level, formulation method, composition, possible toxin content, storage life, chemical and physical properties under different temperature conditions etc.