• A wood-bleaching agent. Oxalic acid is used to lighten gray, weathered wood. It is effective at lightening dark stains in wood furniture as preparation for refinishing. • Oxalic acid is a useful stain remover on stone, brick, wood, vinyl and other surfaces. • Purifying agent in the manufacture of pharmaceuticals. • Grinding agent for polishing marble. • Used as a cleaning agent for various equipment. • It is used in wastewater treatment to remove calcium salts.
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• Vaporised oxalic acid, or a solution of oxalic acid in sugar syrup, is used by beekeepers as a miticide against the parasitic varroa mite. • It is effective at removing rust from metal surfaces. It does this by forming a stable water soluble salt with ferric iron. It is particularly useful for plumbing pipes, kitchen countertops, tubs and sinks. • Used as a reducing agent in developing photographic film. |