Homebrew PCBs

Hi,

Glad you rang in on this topic...

What is the proper way to dispose of used ferric chloride?  Is there 
a way to rejuvinate it?  Someone mentioned adding sulfuric acid, but 
everyone is imprecise about ratios.  Is there a simple way to 
determine how much life is left in the etching solution?  Is there 
an inexpensive way to precipitate the copper out of the solution and 
end up with just ferric chloride?

I'm hesitant to use some of the other recipes.  I've used ferric 
chloride for many years and my main concern was not breathing the 
chlorine gas that gets released.  Now, that I'm more environmentally 
aware, I want to know how to dispose of it properly.  An old bottle 
I had from Radio Shack said to put it down the toilet.  I'm sure 
that's not a good thing to do these days...

Regards,
Dennis

--- In Homebrew_PCBs@yahoogroups.com, "mycroft2152" 
<mycroft2152@...> wrote:
>
> As a chemist in industry, I am constantly amazed on how many of 
the 
> homebrew pcb'ers use hazardous chemicals without the proper 
respect 
> and protective equipment.