Homebrew PCBs

----- Original Message ----- 
From: "Stefan Trethan" <stefan_trethan@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Wednesday, April 07, 2004 12:49 PM
Subject: Re: [Homebrew_PCBs] Phosphoric Acid Etch


> On Tue, 06 Apr 2004 14:33:38 -0000, dsv1486 <darrell.vandenberg@...>
> wrote:
>
> > I used some phosphoric acid and 3% hydrogen peroxide to etch some
> > boards. I warmed it the a hot water bath and it produced a green
> > tint to the solution after etching and did an excellent job. Has
> > anyone had experience with this combination???
>
> interesting...
>
> would be interesting to compare it to the hydrocloric and sulphuric
> etchants...
>
> What about fumes? are there any? the clor smell is not especially nice..
> what about maintaining it in an etching state?
> what happens if there is too much copper and you cool it?
>
>
> i know it is added in some drink, like cola..., what does it cost?

It's also used in rust removers.

Leon