Does not work at all - unknown powder in the bag.
Oxalic acid is used to bleach wood and leather, and to remove rust. I tried to use this on both wood and leather in various concentrations all the way to a point of saturated solution. Nothing worked. No idea what they packaged in the bag. Tried to call the company Florida Labs, they do not answer the phone and do not call back on voice messages. Amazon was nice as always and refunded the purchase, but now I am stuck with white powder in a plastic bag that can be anything. Toxic or not... Unfortunately home improvement stores sell Oxalic acid in much larger quantities, but at least it is likely to work.
Rating: 1 stars