I have a brand new TI carbon steel razor that I've shaved with twice. I thought I had been careful to wipe it dry and air it out after use, but upon taking it out of its case two days since I last used it I noticed a few areas that bear a kind of oily looking black discoloration. It doesn't wipe of with a wet or dry towel. What is this and how do I restore the blade to its mirror finish?

Thanks in advance.

Rick