Homebrew PCBs

ghidera2000 wrote:
> 
> Why would it turn green? Something growing in there?
> 
> 

Considering copper compounds make very good fungicides (down to 
the ppm level) I think it would be a safe bet to say its not 
growing in there :)

The green is obviously due to copper compounds, some form(s) of 
copper chlorides. Add some conc. HCl until the green sludge is no 
longer green, this will dissolve any copper hydroxide and bring 
it back to life.