Homebrew PCBs

I used about equal quantities of each when I experemented. I plan on 
doing some future etching and will let you know how it turns out.


--- In Homebrew_PCBs@yahoogroups.com, "Derek B." 
<hightechsystems@a...> wrote:
> I haven't tried this yet but I can get Phosphoric acid from work 
for about
> $10.00 a gallon. This is 36% acid. You know this is in coke in very 
small
> quantities (I hope) for flavoring weird huh.
> How much of the hydrogen peroxide did you mix with the acid?
> 
> Derek B.
> http://groups.yahoo.com/group/Denver_CNC_Club/
> 
> > -----Original Message-----
> > From: dsv1486
> >
> >
> > Has anyone tried phosphoric acid for etching? I had some left over
> > from a old hydroponics project and added about 30% acid with some 
3%
> > Medical hydrogen peroxide from the super store. It etched a small
> > double-sided board in about 10 mins when warmed in a bath of hot 
tap
> > water. It was colorless before the etching and after it was bright
> > green. There were no fumes or issues as far as I could see and it
> > looks viable as an enchant. Does anyone have any thoughts??
> >
> >
> > --