Lots and lots of Patina Recipes Here's one: Fume patina- Dip item in vinegar, sprinkle w/ salt put it into a container w/ ammonia. Close & seal lid. You want the metal to be suspended above the ammonia so that the fumes create the patina, not direct contact. You can also have a small open container of ammonia sitting inside the larger container that holds the metal pieces. can take up to 24 hours) rinse the metal and dry.