[sdiy] Exposing traces in ribbon connectors

[Steve Begin]

I'm not sure if i'm using the right term here...but I'm referring to those flat plastic interconnects that are typically yellow-brown and are essentially a very thin strip of metal surrounded by plastic.

Does anybody know of a way to expose the traces?  I was thinking of trying some very fine grit sandpaper, or ideally a solvent that dissolves plastic but not copper.

Hopefully some of you nice fellows will have some experience in this matter,

Thanks,
Steve
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