Homebrew PCBs

On Tue, 03 Jan 2006 16:24:52 +0100, Leon Heller  
<leon.heller@...> wrote:

> It should be blue for proper etching. You need to add some concentrated
>
> H2O2, to oxidise the green cuprous chloride to cupric chloride. Adding  
> the
>
> 3% H2O2 will make the solution too dilute. Or, just mix it fresh each  
> time.
>
>
> Leon


NO, not BLUE! It should be green. If it is blue you have no HCl and it  
can't etch.

ST