Howdy again
While it is true that many old guns that had been left in the white, meaning the steel was left raw with no finish at all, developed a patina of rust over time, Browning was also a type of finish that was applied on purpose to protect the steel from corrosion.
ALL Bluing and Browning processes are a form of inducing oxidation on the surface of the steel, to protect the underlying steel from further oxidation. In other words, oxidize the top surface of the steel and you cut off the rest of the steel from contact with the oxygen in the air, preventing further oxidation.. Since 'rust' is just one form of iron oxide, it could almost be said that causing a controlled amount of surface 'rust' will protect the underlying steel from further rusting. A little bit too general, but you get the idea. The chemical processes of bluing, browning, and ordinary 'rust', are slightly different, but they all result in an oxide layer that insulates the body of the metal from further contact with oxygen. Normal everyday rust is crumbly, and peels off. When it peels off, fresh steel is exposed to the oxygen in the air, and the corrosion continues. But controlled Bluing and Browning processes form a thin layer of oxide that does not crumble away, and protects the steel.
In the case of old blued guns hung on a tent pole, the blue produced at the time just was not as effective a barrier to oxygen as modern blues are. I am not an expert on the various modern blueing processes, but I do know they produce a very robust surface. I had a Cimarron revolver a couple of years ago that had been finished with their 'charcoal' blue. It was more like some of the old blues from the 19th Century. It was a brilliant blue color, but it was not very durable and did not provide much protection against oxidation. Within one year, the blue had been completely worn off the backstrap by the salt and sweat of my hand. The underlying steel turned a dull, 'battleship gray' in color. This was the first stages of oxidation. I suspect most of the old guns we see today that are brown, or rusted, went through a similar process.
Now that photobucket is back up and running, I'm posting a photo of one of my Colts. This is a 2nd Gen gun, made in 1968, and when I bought it somebody had already stripped off all the original finish, and it was already a pretty nice 'battleship gray' in color. Almost all the color is gone from the case hardening too. After several years of digesting nothing but Black Powder loads in CAS, the ejector rod housing is starting to develop a very nice brown patina, but it does not show up very well in this photo.
I have had several folks tell me I should send my Colt out to be refinished. The truth is, it is a parts gun. The grip frame and trigger guard are from a similar gun, but are not original to this gun. So, I am not so concerned with making it look brand, spanky new.
The fact is, I like it just like it is.
![](http://img.photobucket.com/albums/v495/Driftwood_Johnson/SecondGen1968.jpg?t=1169234223)