Re: gEDA-user: PCM making methods - was - Re: alarm clock update

[Christoph Lechner <cl0023@xxxxxxx>]

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andrewm wrote:
> If you let the HCl H2O2 just keep going to emerald green you will get 
> CuCl etchant.  You never again need
> to add H2O2 and can regenrate it by bubbling air through it.
That CuCl story sounds very interesting. To be quite curious (and
because I didn't get it yet), I'll sum it up

So you simply mix a HCl/H2O2 etchant the usual way. When you begin to
use the etchant, it's bluish. After some time (and some PCBs) it becomes
green. So when it's green it's CuCl etchant, isn't it???

> I have been using CuCl for a bit over a year now and all I ever need to 
> do is measure the acid levels and
> density and then top up with HCl or water to keep it in spec.
What tools do you use for measuring the acid level? How to you measure
the density? Actually I don't have a complete lab at home, so I want to
keep things as simple as possible.

Do you have any links about CuCl?

TIA
- - C. Lechner
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