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

Quite by accident, I recently discovered that an acidic super drain cleaner composed mainly of sulfuric acid cleans the  FeCl3  stains on hard surfaces almost instantly. The MSDS on these products lists the sulfuric acid content at approximately 90+%. Obviously, they are not to be used on fabrics.

Baxter

--- In Homebrew_PCBs@yahoogroups.com, Leon Heller <leon355@...> wrote:

>
> 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.
>

bebx2000 wrote:

> Quite by accident, I recently discovered that an acidic super drain
> cleaner composed mainly of sulfuric acid cleans the FeCl3 stains on
> hard surfaces almost instantly. The MSDS on these products lists the
> sulfuric acid content at approximately 90+%. Obviously, they are not
> to be used on fabrics.

Once i didn't had more oxalic acid around and i diluted hydrochloric
acid in water, tested in a non visible part of the shirt and them
removed the FeCl3 splashes with the solution. But in another piece of
cloth it altered the colors like bleach. On floor i have only used HCl,
its easier to get.

I guess that any acidic solution will work. Oxalic acid seems just handy
because is a dry powder weak acid and is common available.

Could you share a specific product name?



________________________________

 From: bebx2000 <bebx2000@...>
To: Homebrew_PCBs@yahoogroups.com 
Sent: Wednesday, February 15, 2012 12:53 PM
Subject: [Homebrew_PCBs] Re: Removing FeCl3 stains
 

  


Quite by accident, I recently discovered that an acidic super drain cleaner composed mainly of sulfuric acid cleans the  FeCl3  stains on hard surfaces almost instantly. The MSDS on these products lists the sulfuric acid content at approximately 90+%. Obviously, they are not to be used on fabrics.

Baxter

--- In Homebrew_PCBs@...m, Leon Heller <leon355@...> wrote:
>
> 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.
> 


 

[Non-text portions of this message have been removed]

I bought a brand called, "Clear-All Positive Drain Cleaner" at ACE Hardware in Los Angeles. There are lots of different brands. Just make sure that it has >90% sulfuric Acid. Do a search. For example,

http://www.walmart.com/ip/Liquid-Lightning-Buffered-Sulfuric-Acid-Drain-Cleaner/17133944#Product+Reviews

The acidic products are 100 times better at cleaning a drain than those based upon sodium hydroxide, but be sure to follow the directions for use. There was a lawsuit filed by an idiot who used one of these products. He dumped a bottle down his drain and then for good measure he poured in a glass of water and of course, it exploded all over him.

Baxter

--- In Homebrew_PCBs@yahoogroups.com, Confidential <scuba840@...> wrote:

>
> Could you share a specific product name?
> 
> 
>