Homebrew PCBs

Phil wrote:

> 
> 
> My CuCl is about 1.2 SG and is still pretty slow.  no amount of
> bubbling regens it.   H2O2 make all the difference but its still
> taking abourd 40 minutes to etch a board.  The literature I've seen
> seems to say 1.17 is the target SG.  I guess I should dump some more
> copper in.
> 

If bubbles don't regenerate then your out of acid because ;

2CuCl + O + 2HCl -> 2CuCl2 + H20

note HCl is needed for regeneration.

If you see signs of bright blue copper hydroxide then your defiantly out 
of acid. Put a drop on a piece of glass and it should turn from the dark 
opaque green to bright green in under an hour due to air exposure. If 
not change color then no acid.