On Wed, 12 May 2004 11:04:54 +0200, Stefan Trethan <
stefan_trethan@...>
wrote:
> Strange question, i know..
>
> any ideas how to chemically blacken the copper on a pcb (copper only, not
> epoxy).
>
found something:
<
http://www.cpachem.com/en/madchem/06.htm>
Have no sodium thiosulfate at hand, but did read somewhere else
it might work with sulphur, have enough sulphur so i will try....
suggestions welcome.
(It could be used for heatsinks etc...)
ST