Homebrew PCBs

I was curious about the stuff sold for removing ferric chloride
stains, so I looked up the Mega Electronics data sheet on the stuff
they sell (its made by Bungard). Its simply oxalic acid crystals and
rubbing with rhubarb leaves should work just as well, they contain
oxalic acid. Its quite poisonous, BTW.

Ill see if I can buy some oxalic acid, it should be cheaper than the
stuff sold by Mega.

Leon