If you can see the pcb AT ALL in the solution, you don't have enough etchant in it yet. Mine is so dark, it's basically black, and I can only see the pcb if it's within 0.3 inches of the sides. I check the color by taking a few drops out and checking that.
Message
Re: [Homebrew_PCBs] Re: Oxygen regeneration of CuCl2
2011-05-05 by DJ Delorie