Homebrew PCBs

--- Bill Westfield <westfw@...> wrote:

> Does anyone have any ideas why my regenerated CuCl etchant would
> be a blue-green color rather than the bright green I see on assorted
> web pages?  Etch speed sucks too :-(  Perhaps I areated away all the
> HCl?  Are there impurities that would cause blue rather than green?
> (THis is home-made etchant from HCl, H2O2, and assorted bits of scrap
> copper; wire, pipe, etc...)
> 
> Thanks
> Bill W

regenerated? NO, -> degenerated!

etching is essentially the process of 'converting' metallic copper into water
soluble salts.
if you have an etchant and throw copper into it, then obviously it will do it's
work. if you put in enough of it, you will use up ALL of the etchants power and
the copper on the board will be 'spared'.

EVERY BIT of copper you drop into the bath means THAT MUCH LESS 'board copper'
left to 'dissolve' !!

this is valid for ANY type of etchant, should I say more?


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