Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, Russell Shaw <rjshaw@...> wrote:
>
> The deep olive colour is when to add HCl and use as a long-term 
> etchant.

But, at that point, highly dangerous chlorine gas WILL be generated from the reaction, as was warned about in the other link I referred to where the gent said he'd used the same etchant for four years.