Guns can be blued to any color you want. ANY. Because it's an oxcide salt. You can make empurple, red, baby blue, pink, green, yellow. Most people don't want those colors though. And since guns are used tactically most people prefer something low profile. SO they want a dark color.
It's really rust. When you blue a gun you are surfacerusting that coat to the metal. It's oxidation. You can make them pitch black with the blue salt. It's oxide salt it's just know as blueing salt. I guess cause blue is a more popular color than black. It's easier for dumbies to understand as well.
Not all guns are blued. Many are parkarized which is an oil based finish that is either gray, charcoalor black.
Many manufacturers now used a colored plating over stainless. It's similar to anodized. It's a stainless metal that they coat with a black or blue finish that hardens into a plating. What makes this better is that it makes it better than oxide. Oxcide will still rust. The salt from your hands will cause it to rust so you have to clean it. But with a plated stainless steel you don't have bother with it, ibecause it won't rust or pit. Sig Sauer, Glock, Beretta Smith & Wesson & others use this method on may of their handguns.
You have never seen charcoal blue or rose red? Charcoal blue is a sky blue finish that is bright like neon. And rose red is a really lusterous bright red finish.
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