On Fri, 24 Sep 2004, Denny Esterline wrote:

> I did some rough math based on the specific gravity of the acid/peroxide
> and the reccomended SG of mature CuCl. Looks like the 2 parts 3%H2O2 and
> one part 32%HCl has a SG of 1.07 and CuCl is reccomended at 1.17 So you'll
> need to add about 0.1 gram of copper per cc of etchant (about 100
> grams/liter or 13 ounces/gallon)

So you could boil some of the water off I think ? Would HCl evaporate 
before you lose enough water ?

Peter
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