Homebrew PCBs

Thanks for the information - I knew I had to be doing something wrong!

Mark

At 10:23 PM 3/18/2010, you wrote:
>30 vol is 3%.
>the vol indication is about how much O2 is produced from the product.
>3% has water enough, don't need to add more.
>what runs out is the O2 produced. you can regenerate it either with 
>more H2O2 (more water) or with bubbling air.
>the etchant will last (almost) for ever. if you leave it open, some 
>of the water will evaporate (thats good)...
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>--- On Thu, 3/18/10, mlerman@... <mlerman@...> wrote:
> >
> > Ah, it does say 30 vol - I assumed that was 30% by volume
> > (I'm not by any means a chemist). Please educate me as to
> > the difference and what it implies for my usage!
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