It is carbon in a plastic that melts to hold it in place. So in a high
impedance or high voltage circuit, it can cause problems, but for most
circuits it would likely not cause any problems.
And then you can just be careful not to have printing in those parts
of the circuit.
Steve
--- In Homebrew_PCBs@yahoogroups.com, "Phil" <phil1960us@y...> wrote:
> Interesting question. I think its pretty much an insulator since it
> gets picked up via static electricity prior to fusing. I think a
> conductor would have problems. but I just tried a quick test with
> my multimeter and got nothing. maybe its an issue but i haven't seen
> any problems, yet.