Jax Green Patina itself only works on brass, bronze, and copper. To create the desired effect on your lead solder we would apply the Jax Copper Plating Solution onto the solder (a maximum of 3 thin coats; washing with water in between each coat). We would then apply a THIN coat of Green Patina over the Copper Plated solder. Do not wash off; let it dry overnight.
Bear in mind that the Copper Plating is an extremely thin coat and too much Green Patina will etch off the copper completely. People do get excellent results but a bunch of experimentation will go into getting this to work perfectly.