You are buying 8 Ounces (by weight) of Ferric Chloride. The item is in an 8 Fluid Ounce (by volume) Polypropylene bottle. Ferric Chloride (FeCl3) has hundreds of uses. 8 Ounces of Ferric Chloride added to 2 Quarts of water makes 2 Quarts of Printed Circuit Board Etching Solution. CAUTION: Never add water to powder! The anhydrous powder produces heat when wet. Instead, add small increments of powder to a large volume of water. CAUTION: Fumes in moist air. Inhalation hazard. Keep bottle tightly sealed. Product will absorb moisture from the air and eventually dissolve itself into a liquid. Bottles are made of sturdy polypropylene. The square, “space-saver” shape ensures that the bottles fit snugly on a shelf. The wide mouth makes for easy dispensing and stackability. To ensure a spill-free journey, the screw tops are heat-sealed and the bottles sealed in plastic.