depends upon the pattern. Some I leave black /oxide color and just oil. Others I polish up and make shiney. Others I clean up with steel wool, cold blue then sand lightly with 1500 grit paper and a rubber squeegee.
When you have the etch where you want it, try boiling it in baking soda saturated water and the oxide colors will pretty much stay. ymmv
A gun will get you thru times of no money better than money will get you thru times of no gun.