Well my friends, I play an Ibanez SR605 that I've just purchased new 2 months ago. It came with Elixir strings that I didn't like at all, so a few weeks ago I bought a set of GHS Pressure Wound Flats and had a guitar tech at a local Johnson's Guitar switch the strings. I like the strings don't get me wrong, but for some reason I'm getting black residue on my finger tips after I play. This had never happened before so I assume it's the strings, however the strings are brand new so I don't think the problem is dirty strings. The tech rubbed some liquid on the fret board before applying the strings. Can that be what the problem is? The strings feel sticky at times as well so I might just buy a string cleaner and see if that does the trick. Any other suggestions?