I am replacing "razor only" receptacles to GFCI. The outlet contains a LINE cable (black, white, bare copper). The previous receptacle of course did not use three prongs, so the ground was just secured to the outlet box's grounding terminal (screw).
To install the GFCI according to the instructions, I need two new pieces of wire for the ground pigtail: one to the grounding terminal, and one to the receptacle's ground. See diagram below.
My small problem is that I don't have green or bare copper wire. I have suitable 6" 14 AWG wire scraps from the old receptacle, but they are white or black.
Would it be terrible if I used the wrong colors to make the pigtail? Electrically of course there's no problem. Potential confusion is the only issue I can see, but since it would all be in the same outlet box, maybe that's less of a problem?
It also occurred to me to strip the black/white insulation and thus have bare copper, but it is stranded (all the wires from LINE are solid), so that seems like a bit of a mess. Is that even ok to do?