Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "lcdpublishing"
<lcdpublishing@...> wrote:
>
> Hi guys,
> 
> I have been using Ferric Chloride for a few years now - works fine 
> and is easy to get and dispose of when spent.  The downside is the 
> mess.
> 

May I ask how one is meant to dispose of FeCl3 etchant once it's spent?
I've been stockpiling my waste etchant for too long, some time soon I
need to get rid of it safely...

Thanks.
Steve.