I'm doing a little experiment on reducing iron oxide back to bare iron. I'm going to use a blued rod, coconut oil and ultraviolet light. Im using coconut oil because information from this site suggests that it is very transparent to uv light. https://www.hindawi.com/journals/jspec/2013/540417/ I'm using uv light so that the bare metal layer created is very superficial. It also should allow me to prevent rusting because the fresh surface will still be oiled until I can get it in an oxygen free environment. I've reduced graphite oxide to graphite with uv light but never a metal. Does this sound feasible? Are there commercial processes that are easily researched that would be more applicable to my needs?