--- 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
Message
Re: What is the best etching solution;
2009-04-27 by Bob_xyz