Homebrew PCBs

On Sun, 21 Jan 2007 11:39:07 +0100, mycroft2152 <mycroft2152y@...>  
wrote:

>
> For etching you really don't need the 30% H2O2, it results in a very
> violernt reaction. I found out the hard way.The standard 3% is just
> about the correct diluted strength. Yes, a stroneger versioon is great
> for regeneration, but the stuff is so cheap anyways.


Yes, but the added water would grow your etchant too much.
I think for CuCl you _do_ need the stronger stuff.

Maybe one can freeze concentrate the 3% stuff, i never tried, and it would  
surely be safer and cheaper to just buy the 30% version.

ST