Homebrew PCBs

Len Warner wrote:
> 

> Do not use anything which looks like a food container
> (and especially a soft drink bottle) particularly if you
> expect small children to be around and even if you don't ;-)

And thats why you label your containers, with poison signs.

> I would recommend neutralizing your effluent with a small
> excess of garden lime and immobilizing the precipitate
> by the addition of a little cement. ...

Yes, if end goal of the OP was to ditch the etchant, then I'd agree 
completely. "pcb.easy" seemed to be asking how to collect and store Cu(OH)2.