i was asked to engrave on the metal of a stevens 311 but wasnt sure how to go about doing it. i wasnt sure if i would be able to cut into the color casing with out ruining it. can you case harden pre cased metal? he said it is faded and he wanted to re case it but i have had little experiance hardening and dont want to open a can of worms. if i engrave it can it be recased or would it be better left alone? if i dont engrave it can i heat up the metal like i was going to harden it but for a shorter time to bring back the colors? i dont plan to harden his any time soon i have learning to do yet, i am simple asking