Anyone here knows much about these?  I want to make a PCB to fit in an =20
existing enclosure with existing buttons, and wondering what I need to =20
do for the PCB side.  The always seems to be black, and IIRC this is a =20
carbon coating...?  Can I use regular HASL for this?  Or will it =20
tarnish over time?  Is there anything DIY I can do to make it =20
tarnish-proof?  I only want to make a handful of these, so I expect =20
getting PCB's with non-standard coatings will be cost-prohibitive I =20
suspect.

Cheers,
-Neil.


--=20
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