You also have a third choice. Hardboil two eggs (yes! or boil three and use one for tuna salad for lunch.) Dice them in small pieces and put in a tight-sealing container. Put your shiny copper pieces into the container up on blocks, etc., so they aren't touching the eggs but are in the eggy H2S atmosphere (phew!) Check the next day for the patina. Leave another day if required. Might have to re-egg. Afterwards wash pieces, might want to lightly steel wool highlights, lacquer. Good-bye old egg parts. It's how I got patina on a too-shiny escutcheon on this radio:
