Customers can purchase oxalic acid in bulk from scientific or chemical suppliers, such as Biological Science Supplies and WEGO Chemical & Mineral Corp. Alternatively, a buyer can purchase cleansers or wood bleaches containing oxalic acid at Amazon.com or Ebay.com and at home-improvement stores such as Home Depot and True Value.
Oxalic acid is primarily used as a household or industrial cleanser and works especially well on rust stains. Its properties also make it a good wood bleach. It is also used to set dyes, and beekeepers use it as a vaporized miticide. For an organic acid, oxalic acid has a high dissociation constant, meaning it can easily cause burns. Consequently, those using it should take proper cautionary measures.