Homebrew PCBs

On 10/03/13 01:30, Rick Sparber wrote:
> The bottom line of this article is to turn the ferric chloride into a solid
> and then just dump it. Any liquid removed can be poured down the drain.
>
> I like the idea of mixing it with cement to stabilize the solid. One thing
> the author said is that ferric chloride can't be rejuvenated. A while back
> someone suggested it could by using steel wool. Didn't work for me.

Steel wool will do nothing. You only use it when you want to create it in the 
first place.

By aerating the ferric chloride (possibly just with bubble etching like i do), 
it becomes copper chloride etchant and lasts years. Start off with 1:1 dilution 
with water. Add a bit (like 5%) HCl acid every few months. Keep covered when not 
in use. Disposal is nothing more than flushing money away.