Rust Bluing on Welded/Soldiered Luger Parts

I have wondered about this for a long time--can the steel be matched up through welding to fill pits or holes then rust blued to an even finish. I thought it might require testing the type of steel in the pistol and trying to find a welding rod to match. Apparently the steel match can be done.


What about micro-welding, that is, can very small areas of pits be welded even if close to a marking that must be preserved?


dm