Here are a couple of ideas for copper patina.
If you are using a copper patina, place some of the liquid copper patina in a separate container and add a couple of drops of lemon juice. This will impart a rosy glow to your copper patina.
Use jeweler’s rouge to polish your copper patinaed items; it will keep the copper glow alive.
It stands to reason that the cleaner and shinier the solder seam is before you apply the patina, the better it will look after you have applied the patina, so thoroughly clean and rub or buff shine the finished solder seams before applying the patina. It should go on more smoothly and give a better finished look.
(See previous post on cleaning the seams to avoid “white mold.”)