I have to put my 2c in on this. Too many years ago when I was in high school I did a lot of PCB etching. I dumped it all down the drain. Many years later after I bought my parents house, I got my reward. The drain pipes were black iron and were eaten away. The ones not involved with my choice of disposal were in great shape. A question about some of the "dumping" going on. Are these "experts" being asked how to dispose of Ferric Chloride? or spent Ferric Chloride full of dissolved copper. The one with the dissolved copper is a hazardous waste. Where I live I can just put it in a safe container, label it and take it to our waste facility office for proper disposal.
Roger
--- In Homebrew_PCBs@yahoogroups.com, Leon Heller <leon355@...> wrote:
>
> On 08/06/2010 18:24, Frank P wrote:
> > Malcolm,
> > Where do you get sodium hydroxide?
> > Also, is your disposal method the "official, recommended" method of disposal?
>
> My local hardware shop sells it.
>
> Just pour it down the sink, it's used as a drain cleaner.
>
> Leon
> --
> Leon Heller
> G1HSM
>