The item for sale is 8 Ounces (227 Grams) of Sodium Persulfate (Na2S2O8). Sodium Persulfate is commonly used as an etchant for copper, iron, brass, and other metals. Unlike Ferric Chloride, Sodium Persulfate makes a colorless, clear solution allowing for easy monitoring of the etching process. Etching with Sodium Persulfate requires no heating baths and produces hardly any fumes. Bottles are made of durable Polypropylene Plastic, which is a natural, translucent, lightweight, durable, and chemically resistant copolymer. The screw-top is completely leakproof. Bottle is sealed in plastic with the screw-top shrink-wrapped. HUNDREDS OF USES INCLUDING: Metal Etching (Copper, Zinc, Nickel, Cadmium, and Iron) / Hair Bleaching Products / Metal "Pickling" Agent / Starch Modifier / Chemical Reagent (Oxidizer) / Metal Cleaner (Sensitizer).