Jax Green Patina Colourant All Jax metal finishing and polishing solutions are easy to use, produce authentic, consistent results, require no heat or electricity, are water-based, contain no sulfur, are non-flammable and react within seconds. Jax green patina colourant produces a permanent, antique green finish on copper, brass, and bronze. Available in 2 oz. and 1 pint sizes.