I am doing some work with brass came, and would like to be able to apply a patina to my solder joints. I have looked around town, but both sg supply stores here don't carry any such patina. I was informed that there used to be such a patina available but it hasn't been seen in some time.
Does anyone know where I could find such a patina? Alternatively, does anyone know how to formulate one? I would really rather use a patina than a paint pen, but will if I absolutely have no other alternative.