Homebrew PCBs

Ken Stuempges wrote:
> 
> 
> 
> Howdy
> 
> I have this "hare-brained" idea on another method to regenerate Cuperic 
> Chloride etchant. I plan on getting some "Oxygen Tablets" (used in fish 
> tanks, live bait tanks, etc), and placing one of the tablets in a closed 
> container of water to generate oxygen.
> The container will be connected via a tube to my bubbler, rather than my 
> air pump. As a result, pure oxygen will be bubbled, rather than air. I'm 
> guessing that it should be as fast a regenerator as Hydrogen Peroxide . 
> . . and not any more expensive when compared to 30 or 40 volume Hydrogen 
> Peroxide - plus the etchant will not be diluted.
> Any comments ? Has anyone tried this? I'll post my results
> 
> Ken
> 

I don't see why it wouldn't work. A bit expensive though for what you 
might possibly gain in relation to regeneration speed compared to room 
temperature air bubbling.

Are you having trouble with air regeneration ?
Is the acid high enough ?

The solution doesn't have to be bright green in order to etch. Its 
difficult to specify, but etch speed only slows down when its "really 
dark brown". If you take a tank sample in a test tube, dilute ~10:1 with 
water and if you don't see any visible signs of white precipitate then 
the copper(I) chloride is below limits and should etch ok.

Adam