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When a metal reacts with oxygen, a metal oxide forms. The general equation for this reaction is: metal + oxygen → metal oxide. Some metals will react with oxygen when they burn. These reactions are called combustion reactions. Two examples of combustion reactions are: Iron reacts with oxygen to form iron oxide:. It is too riskey due to the long time needed for drying or polemerizing. For a good traditional finish, I use blo, turpentine, and beeswax. I Mix Blo/turps 50/50 and if I use a quart of each, about a walnut size piece of beeswax. Apply at a black heat. When it smokes off and leaves your iron black, its the right temp.