1.Hydroquinone photo grade 2.Cas no.:123-31-9 3.White or off- ... , polymer retarder, desulphurization in fertilizer, urea synergist antioxidant, analyse chemical reagent and so.Packing: 25kg (net weight) kraft paper bag lined ... , polymer retarder, desulphurization in fertilizer, urea synergist antioxidant, analyse chemical reagent and so.Packing: 25kg (net weight) kraft paper bag lined ...