We have here another case of where we put very useful basic things beyond our ability to find. But you can buy it here on ebay. It comes in a labeled heavy duty zip-lock bag inside a tyevx overwrap.1 lb oxalic acid rock deck driveway xtl cleaner lapidary materials 1 lv oxalic acid rock deck driveway xtl cleaner please onte that this is a poison, and can be nasty. TI can be more than a mild sting, an irritation, it is not like boric acid and you’d better know the reason why. You can use our oxalic acid to clean iron stains from minerals such as quartz etc. This will be supplied with instructions and tips in detail in a 2 page flier. Variations in use such as bleaching wood and much more, especially precautions, will be fully covered. Anything i use i also sell and try to provide good directions for got questions? I’ll give a shot at an answer. I also sell silver solder, in kits and bulk along with fluxes, in many forms for jewelers, smiths, hvca techs, anyone who brazes most ferrous and non-ferrous metals including stainless steel. It is based on a us navy spec for timber preservation. It contains a custom mix of these chemicals designed as an insecticide, fungicide and genearl undercoat for sheds, barns, houses, and timbers. I do not have an epa registered facility, so i cannot mix it, but it is simple! It will control subterranean termites, formosan termites, cockroaches, palmetto bugs, waterbugs, ants, silverfish, carpenter ants, and powderpost beatles as well as amny fungi and moulds. See my listing, this stuff works great, is easy to use and won’t hurt the environment!