Transparent, colorless crystals. Occurs naturally in many plants (wood sorrell, rhubarb, spinach). Once processed, it is corrosive and may be fatal if swallowed. You should avoid contact with your eyes, skin, or clothing.
A popular use for Oxalic Acid is wood bleaching and removing dark water stains from wood.
Mix three parts oxalic acid with one part warm water to create a paste. Use the paste on wood stained by water marks. The paste is used as a spot treatment and should not be used to cover an entire surface. More instruction at eHow.com.
Other uses include general metal and equipment cleaner, leather tanning, and bleaching textiles. Rust remover in mineral crystal preparation.
Oxalic Acid only ships to destinations within the continental United States and Canada using UPS ground. No air deliveries allowed.
Oxalic Acid is also used in the following patina formulas: