I'm lazy, rather than setup an air bubbler system, each time I etch I
just chuck in a capful of 35% peroxide and give it a stir.
Typical 5x5 cm double sided board etches in about 5 minutes, board
vertical in the "tank", just manually moved back and forth gently.
Have never measured the etchant in any way other than "yep that looks
about the right shade of green".
Philip Pemberton wrote:
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> I left a board etching earlier this afternoon - after half an hour the
> CuCl had taken a fair bit of copper off but seemed to stop etching as it
> got towards the end. I ended up dumping the board in the ferric chloride
> tank to finish it off.
>