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Fingertips turning black

My Fender Steve Harris P-bass came with Fender round wounds on it. The strings play and sound fine, but they turn my fingertips black. :cautious::oops::jawdrop::eyebrow: Never had strings that did that before. I'm thinking they may have nickel in them. Anyone else have this happen? Know the cause?

Yes. It a combination of either or, dust, machine oil ( or from the fried chicken at last night’s gig), oil from your fingers ( if you get smear marks on your cell phone screen, that may be a clue) and oxidation. Got it all the time with Roto Sounds. Make sure you are wiping down your strings before you put it away.
 
This is a new base with factory strings. Strings probably sat on the bass for quite some time.

If other strings aren't turning your fingers black, I'm guessing it's something about the factory strings, maybe dust or an incomplete finishing/cleaning process. Factory strings probably don't get the same attention as strings we would purchase new and install ourselves.
 
My buddy used to own a music store, he'd get some real cool mother of pearl done up guitars from Vietnam. I'd get to play em when they arrived, help set em up. Whatever strings came on em would make my finger very black. I'm betting they were made out of plain old steel, worst I've ever seen.
 
I have experienced this with new double bass strings but very rarely with electric bass strings. But then I tend to sweat more when I play double bass so perhaps that's it...???