Homebrew PCBs

On Fri, 17 Dec 2004 23:19:59 +0000, Les Newell <lesnewell@...>  
wrote:

> Hi,
> I have been using CuCl etchant for a while now. Before etching I add a
> tablespoon of 100 volume H2O2 and away I go. Recently something has
> changed. When adding the H2O2 the soulution used to bubble slightly and
> change colour from muddy green to a nice blue-green. Recently when I add
> the H2O2 it bubbles violently and nothing else happens. Has anyone else
> had this problem?
> Perhaps I should just dump the solution and start again.
> Les


You have forgotten to add HCl.
You did check the molarity from time to time, right? ;-)


ST