YD wrote:
>
> If you add muriatic (hydrochloric) acid and oxygenate
> it converts to copper chloride. Looking at the
> reactions described in
>
> http://artmondo.net/printworks/articles/ferric.htm,
> http://www.p-m-services.co.uk/ferric_chloride.htm and
> http://members.optusnet.com.au/~eseychell/PCB/etching_CuCl/index.html
>
> you'll find that with excess acid the iron turns into
> insoluble ferric hydroxide (rust) and falls out as
> sludge. What's left is the regeneratable CuCl2.
>
> I did this myself for my etch tank so I know it works.
> In the beginning it seems quite messy due to the rust
> depositing on the walls and bottom of the tank but
> careful decanting and a good scrub takes care of it.
>
> - YD.
How about a bottle of compressed pure chlorine gas ? Just throw a hose
going from the regulator mounted on the cylinder, to your bubble etcher,
and let it rip. :) May not be a good idea to do this in the kitchen.