Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

If you have dark green, you have CuCl. Pour it into your other tank and
turn on the bubbler, that's all. Note: dark GREEN is good, dark BROWN
needs more air time.

See http://members.optusnet.com.au/~eseychell/PCB/etching_CuCl/ for the
rest of the chemistry :-)