OXALIC ACID 99.6% Pure, Rust Remover, Wood Bleach, Boat Cleaner and More Oxalic acid's main applications includes cleaning or bleaching, particularly for the removal of rust from metal. Its usefulness as a rust remover is due to its forming a stable, water-soluble ferric iron saline. Oxalic acid is also used as a bleach for wood and can easily remove black stains caused by dissolved iron that bonds with the wood. Beekeepers use it to keep mites off bees. Stone masons use it to polish marble and other stones. Oxalic acid has hundreds of different uses! Key Features: OXALIC ACID 99.6% PURE (Dihydrate) Cleaning agent and stain lifter Rust Remover Iron stain remover Metal Cleaner Bleaching agent for wood Concrete stain remover Home, garden, industrial commercial applications Miticide for beekeeping Quartz cleaner and much more