Archive of the former Yahoo!Groups mailing list: Homebrew PCBs
Subject: Re: [Homebrew_PCBs] Re: Old GL FeCl -very slow etching copper
From: DJ Delorie <dj@...>
Date: 2010-05-15
I've always used 3% but in this case, you only need the H2O2, not the
water it's diluted with. If you have easy access to stronger H2O2, go
ahead and use it.
Another option is to heat up the FeCl to make it work faster. I just
float the bottle in some hot tap water for a while.