Real Deal Case Colors

[ed good]

wonder if one did a rockwell hardness test of harden lock plates and floor plates vs hardened receivers, would one find that the thinner metal lock plates and floor plates would be harder than the receiver...the theory being that thinner bar stock parts would in fact be harder than the thicker roll stock receivers? if so, perhaps harder metal retains case colors better and longer and than does less hard metal...all else being the same, of coarse.