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Subject: Re: What is the best etching solution;

From: "Bob_xyz" <bob_barr@...>
Date: 2009-04-27

--- In Homebrew_PCBs@yahoogroups.com, michael tenore <wb2lcw@...> wrote:
>
> I believe it has been said that 30 to 35% Hydrogen peroxide can be
>found at Beauty Parlor supply stores!
> 3% is too weak to bleach Hair!

Beauty store hydrogen peroxide doesn't come in percentages that high.
IIRC, 20 volume hair bleach is 6% H2O2, 30 volume is 9% and 40
volume is 12%. (The 30-35% variety of hydrogen peroxide is only
available from industrial suppliers.)


Regards, Bob