Homebrew PCBs

Herbert,

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!

Mark


-----Original Message-----
>From: "Herbert E. Plett" <cachureos@...>
>Sent: Mar 18, 2010 9:18 PM
>To: Homebrew_PCBs@yahoogroups.com
>Subject: Re: [Homebrew_PCBs] Re: Etching Problem
>
>are you sure it is 30%, and not 30 vol?
>30% is very hard to get.
>don't put any water in. to reuse add more H2O2, water enough...
>
>
>--- On Thu, 3/18/10, Mark Lerman <mlerman@...> wrote:
>> I'm using 30% H2O2, not 3%, but I
>> have to do some calculations to 
>> compare the two.
>
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