Can anyone think of a reason why an old (but clean) knife would consistently rust. Unless I dry it very quick and oil it, it will rust even while I'm chopping something. Will turn even onions colors. I feel stupid not just throwing it out. Can this make us sick? It is really "rust" in it's truest form? Is this not a kitchen utensil? I love to shop 2nd hand. I bought this in the kitchen section and can only find one other reference to it on the entire internet..and the person blogging was using it for cooking. The knife chops remarkably well. The whole situation is rather confusing. Thanks so much!