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

----- Original Message -----
From: "Stefan Trethan" <stefan_trethan@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Tuesday, October 03, 2006 7:34 PM
Subject: Re: [Homebrew_PCBs] Removing ferric chloride stains


> On Tue, 03 Oct 2006 14:42:16 +0200, leon_heller
> <leon.heller@...> wrote:
>
>> 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
>>
>
>
> I am told a little hydrochloric acid does the job too, but haven't tried
> myself.
> Prior to learning that i tried to remove a FeCl stain on a pair of jeans,
> attempted to do it with by rubbing a chlorine tablet from the pool on it.
> I got a small ferric chloride stain in a huge bleached spot, and one more
> pair of "bad" jeans for dirty work....
>
> I am glad i don't need to deal with the bottled stain from hell any more.

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 for removing rust stains, this was
long before PCBs were invented.

Leon