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my understanding...
originally the color came from surface hardening, but today it is often more about the color, than the surface hardening... ( heard if they aerate the cooling solution & add a surfactant, that is how they get the crazy beautiful colors )...
I've also heard that case coloring is to an extent damaged by UV rays, so the pretty guns should not be displayed where the sun shines on them...
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In life you either make dust or eat dust...
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