Pickling is the immersion of metals in an acid solution for the purpose of removing surface fire scale and oxides caused by heating, annealing, casting, soldering etc. Sulfuric acid is often used, but sodium bisulfate is more commonly used. Sodium bisulfate (not to be confused with sodium bisulfite, which is quite a different material) is sold under various trade names. Sparex, ProCraft Pickle and our own brand name, Safe-T-Pickle, are just a few of the various trade names for sodium bisulfate. It's all the same stuff, so buy the one you're most comfortable with. Pickle solutions work better when heated to a temperature of about 125° F. If not using an electric pickle pot, we recommend the use of Visionware by Corning.