Homebrew PCBs

Thanks for all the suggestions - the solution is not olive at all.  It
appears to be a clear, bright green.  I would have called it "lime
green" but its not far from emerald.  So it looks like I need to find
some concentrated H2O2.  Anyone know a source in the Seattle area?

By the way, I think there was some etching going on - the surface of
the copper took on that characteristic flat texture you get when
etching first starts.  Of course, this was after 45 minutes...  sigh...

Phil