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??
>
>
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