Some case colors are more durable than others when it comes to wearing them down or aging them back.
Some things to try is a stainless wire wheel such as one you would use for carding off barrels when bluing. Or handing it heavily with tougher leather gloves. Other chemical methods like Vinegar and bluing remover will also effect/remove case colors. I have found that vinegar is slower in removing case colors than actual bluing remover.
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B. Dudley
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