Well, 2 parts mostly water will dilute the acid to roughly the 10% range,
which i think is about right, and the amount of H2O2 could be in the right
range too.
I don't remember clearly how much H2O2 i used at the start of the etchant,
these days it's maybe 5ml, i never measure.
If you want to regenerate it you need stronger H2O2 than medical, so you
can use that for starting as well (cheaper).
ST
On Thu, 09 Feb 2006 21:28:57 +0100, newaag <newaag@...> wrote:
> Can you confirm / deny this formula from "files" here is appropriate?
>
>
> "I have successfully used 2 parts 3% medical H2O2 with one part 31%
>
> acid - no additional water. It's pretty close to the same mix when
>
> you're done. Etching times of 7-10 minutes."
>
>
> I used this same formula at room temperature and etch was faster than
>
> 7-10 minutes with a bubbler. But no bubbling on its own.
>
>
> BTW, I found out the hard way, the oxygen "bubbler" you put in the
>
> etch tank needs to be plastic with this etch solution - I used
>
> aquarium bubbler "stones" and they disintegrated. Makes sense in
>
> retrospect, hardware stores sell muriatic acid to clean brick and stone.
>
>
> Bob