Non ce' di che!
The oil of the finger-print, if left on the blade, will cause it to oxidize faster than the rest of the steel -voila', finger-print! I have a couple blades where you can almost see the worls of the finger-print. So, its a good idea to wipe down a blade with alcohol or other solvent, then re-oil, every once in a while, rather than just re-oil. I do that pretty much after every time I have to handle the blade itself.