The finishing treatments and protective coatings for metals like iron and steel aren't strictly limited to dielectrics like paint, varnish, wax, epoxy, etc. Two common finishes for firearms of this vintage are bluing and parkerizing. Under harsh lighting, a fresh example with a good surface finish could be mistaken for…
I have been noticing that some high level weapons artists have metalness in their materials in where it would be considered painted metal(which would mean no metalness). I have seen this on multiple occasions on Artstation and also in texture packs. This is very confusing to me as in reality, only the exposed underlying…
The short answer is yes. With some research and experience it is possible to look at a single picture and get a rough idea of what coating was used but it's not going to be perfectly accurate. There's a lot of contextual information missing and in this case a single picture on it's own isn't representative of anything…