Homebrew PCBs

On 10 Apr 2014 11:09:00 -0700, you wrote:

>I just tried another version of etchant solution. 1. Lowels lumber yard Crown Muriatic Acid  and 2. Drug store version of hydrogen peroxide 3 % type. Mix 1 & 1/2 cup muriatic acid and 3/4 cup hydrogen peroxide in a plastic tupper ware container. My board size was equal to 4 in. times 8 in. Time 
> around. 30 min. My question is I do not know the strength of the Crown version
> of the muriatic acid. Is this time normal and is there a way to speed up the time the board is in the tray

I think less muriatic acid and more H2O2, say 1 part to 4 parts or 1
part to 3 parts.


Harvey