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Subject: Re: [Homebrew_PCBs] Removing ferric chloride stains

From: lists <stuart.winsor.lists@...>
Date: 2006-10-03

In article <000801c6e729$c819fea0$0401a8c0@LEON3>,
Leon Heller <leon.heller@...> wrote:
> I tried HCl once, it doesn't work! I've also tried bleach (chlorine) and
> H2O2 and they didn't work, either. I remember reading in an old book
> when I was a kid that oxalic acid was useful

The commercial FeCl3 stain remover I purchased (RS Components in the uk,
or maybe Farnell) contains Oxalic acid but, to be honest, I don't think
I've ever used it.