Homebrew PCBs

Last time I got some, I was told by the shop owner that the strongest
they are allowed to sell these days is 17%.

Les


Stefan Trethan wrote:
> 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
>
>