The end of this article talks about disposal.
http://www.adafruit.com/blog/2009/01/25/the-chemistry-of-home-etched-pcbs/ --- In Homebrew_PCBs@yahoogroups.com, "Rick Sparber" <rgsparber@...> wrote:
>
> I have about 1/2 pint of used ferric chloride. I put it in a pint plastic
> containers and mixed in a lot of baking soda. It is now a thick brown paste.
> Our city has a hazardous waste collection day but I figured this stuff might
> be trouble so called ahead. After a few hours, they called back and said no,
> they can't take it. So what else can I do to make it safe for disposal in
> the garbage?
>
>
>
> Thanks,
>
>
>
> Rick
>
>
>
> [Non-text portions of this message have been removed]
>