... smell of SO2,soluble in water,the solution is acidic.Usages: Fiber, photo ,pharmacy,chemical ,petroleum chemical and so on. Packing ... smell of SO2,soluble in water,the solution is acidic.Usages: Fiber, photo ,pharmacy,chemical ,petroleum chemical and so on. Packing ... smell of SO2,soluble in water,the solution is acidic.Usages: Fiber, photo ,pharmacy,chemical ,petroleum chemical and so on. Packing ...