Yes; turns it black. Generally done for resistance to solar UV.
Just a good high-impedance multimeter (that can measure multiple
megohms) and whatever you can stick its leads onto. Frinst black PVC
pipe is recommended not to be used as a secondary coil form for Tesla
coils because it's a (really crappy) conductor.
Not in glass per se. Glass does not wet graphite. Probably fiberglas
Any conductor mixed into any dielectric will show conductivity. There
will be a threshhold concentration, depending on the shape of the
conductive particles re percolation conduction, at which things take
off. If you want to lower the concentration threshhold, add
conductive fibers (e.g., graphite fiber chopped roving).
If you add carbon it turns black. If you don't like black try indium
tin oxide (with maybe 1% zirconia added when it is synthesized to
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