Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, Stefan Trethan
<stefan_trethan@g...> wrote:
> Strange question, i know..
> 
> any ideas how to chemically blacken the copper on a pcb (copper
only, not 
> epoxy).
> 
> For optical purposes, not electric. should be even colored.

I found something at an art store a few years ago called "Liver of
Sulphur" which I used to blacken copper for antiquing purposes.

No idea what was in it, or where I have the bottle now to check. Google.

Steve