Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

Oxalic acid is about the only stuff that removes FeCl3 stains from
clothes etc. I bought some a long time ago, but have never needed it
until my latest PCB making exploit, when I got a couple of small
splashes on a pair of cotton trousers.

I added a teaspoonful to a little water, and stirred it until it
dissolved. I soaked the stains in the solution and left them for about
30 minutes. Most of the stains had gone, and I washed the trousers with
some other things. The stains are barely visible now, and will probably
disappear completely with another treatment.

Oxalic acid is sold on Ebay, for whitening wood on boat decking. It's
rather toxic, so don't drink the solution.

Leon
--
Leon Heller
G1HSM