On 01/08/13 02:33, Harvey White wrote:
> Why bother to go that way when the copper from the boards you would
> etch would do the same, and get the boards etched? With a lot of
> oxygen available, you'll find that these boards will etch rapidly in
> the fresh mixture. As the O2 from the peroxide dies off, the bubbled
> air will substitute for that and you're building your CuCL2 etchant.
I mixed the stuff up yesterday, but I think the etchant might be a bit
short on oxygen - after an hour or so it turned a dark brown and pretty
much stopped reacting with anything.
I've left an aquarium air bubbler running overnight with the copper
removed. I'll see what that does but it doesn't look promising and I'm
out of H2O2... :-/
Thanks,
--
Phil.
ygroups@...http://www.philpem.me.uk/