Supplied in crystal format. Use Oxalic Acid for wood bleaching and the removal of stains.
Directions for use : Mix 100g of Oxalic Acid with half a litre of warm water. The bleaching process will continue for 1 – 2 hours. When the wood is bleached the surface should then be washed with water. If the wood is not pale enough it can be bleached again using the same process.