If you are referring to that brownish layer at the blued surfaces of the Star modelo Super B pistol it IS definitely rust. Some of them are rusted more some less. It is absolutely normal for blued guns to develop a very thin layer of rust which is nothing else but a red iron oxide, Fe2O3, especially if the handgun like the Star is over 40 years old!. The bluing itself is a black iron oxide, Fe3O4, which to a small extent protects against formation of Fe2O3 (rust) but not completely. I have brand new deeply blued rifles like the Zastava M22 and M85 and they also have a very thin layer of Fe2O3 developed on the relatively thick blued layer. You can’t see it with a naked eye but it’s sufficient to rub a white cloth for a while and it becomes reddish from the rust. This is absolutely normal phenomenon. Like I said in my previous post, I spray a blued surface with Ballistol, wait for an hour or so and then rub in the Ballistol into the surface with a white cloth. I change the cloth a few times because it becomes reddish from removed rust layers. I do it until there is no red color on the cloth. Then again apply Ballistol and leave for storage. This way, the surfaces are seasoned and the tendency to rust is greatly diminished but still every 4-5 months I rub the surfaces with Ballistol and every time I can see a bit of reddish color on the white piece of cloth. The blued surfaces on guns need a constant care. Not so with phosphated, Cerakote, DuraCoat, Gun-Kote, Tenifer, Bruniton and many other gun coatings developed in the past 40 years. They are much more rust resistance than simple bluing.Originally Posted by El_Monty457
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