Thread: Devil's Spit Theory

Oils - depending on their actual composition - will to a lesser or greater extent be hygroscopic. That is they absorb moisture over time - this is why old oil often appear emulsified. The water doesn't so much get under the oil as travel through it. There's a lot of different factors invovled so the time period this occurs over can vary hugely.

With these razors being packed away indoors it would have taken a relatively long time for the absorption to occur especially if you live in a dry climate. The staining you are seeing is most probably simply a result of the oil absorbing small quantities of water and causing some oxidisation. This tends to be fairly minimal as there would not have been much oxygen available under the oil film (what we engineers refer to as anaerobic conditions).