It's rather amazing how fast copper really tarnishes, while I'm cutting it it's almost a pink color
and within minutes it has turned to what we all know as bright copper color.
Yes the acid in our skin oils will tarnish copper faster, take a nice flat piece and sand it clean
with some 600 paper or polish it clean then put your thumb print on it and stick it in your sock
drawer for a month or two and then go look at it.
Your thumb print will be etched into the surface forever
This winter i finally started, and finished my Stingray -3 "head" which was similar front idea as far as modding the front of a flash light. I guess i'll kick myself in a butt and finally post a review. Quite a lot of work.
about the copper when you polish it and put a clear coating on it you should be fine :beer: and if you want to make this piece of copper unique, do what flamin said put your fingerprint on it let it set for two months and then clear coat it lol.