I went away for a two week vacation from the shop I work at. When I
returned I noticed that all the bits and burs as well as my files
were rusting. It occurred to me that when I had a gas leak at my
home shop, all of my silver around my bench had tarnished to a golden
color. With this in mind, I concluded that it just may be a gas leak
causing the rust. Sure enough, we had a gas leak. None of us smelled
the gas. The message I am trying to pass on is this, If something
mysterious is going on in your shop, Check for a gas leak.