Today I finally tried applying a hot towel, and, since I had the damp towel handy during the shave, I also tried wiping the blade instead of rinsing it. After I was done I noticed this strange discoloration on the blade. Is this "lather burn?" Something worse? Can I/how do I get rid of it? How do I prevent it? I know the pics are pretty bad; in case you can't tell, the discoloration is mostly grey with a little brownish.