Oxalic acid: the content is 99.6% or more, it is the crystalline or powder, it can be made the pentaerythritol, cobalt oxalate, oxalic nickel, basic green, steel, soil analysis complete set of reagents, and chemical reagent in the chemical industry. And they are also the rapid dye as a chromomeric agent and help straw, straw products, fabric bleach can remove the iron contamination on the track.