I recently received a razor that was found at my Grandfather's house after he died. It was packed in a box with alot of old stuff. Everything in the box was dry and didn't have signs of being wet at any point. The razor had oil on it still, but in some spots the oil seemed thicker and under the oil after wiping it off there was devil's spit. I am wondering if the oil breaks down after so long and that is what causes devil's spit or if the waxed paper that was wrapped around the razor broke down and mixed in with the oil to make it thicker almost like a congealed grease and that is what caused it. The devil's spit only show in spots where the thicker oil was. Now if only I knew what type of oil was on the blade. This is just my rantings after seeing the razor and having always wondered what could cause it.