Some metal items, if placed in a dishwasher, or washed at certain temperatures, or with certain chemicals can change color. Super shiny stocks pots can go a lusterless gray, for example. Have you had this happen to you? This process is called Oxidation. It can be unsightly, sure, if you care about that (but I know what the inside walls of a smoker looks like and Eeeewww...) but here is my question: Does oxidation pose a health problem? Please cite sources if you have them.