Material and surfaces.
Golden tones are only achievable on bronze.
Oxidation can appear on ferrous metals.
Protection coating.
Wax protection maintains the natural aging of the finish, but it is prone to scratches or stains.
Permalac protection slows down the aging of the finish but highlights imperfections that are not apparent to the eye.
Environment.
Patinas exposed to sunlight can change their tone due to UV rays.
Humid and saline environments age the finish quickly.
Cleaning and maintenance.
This finish must be cleaned with a cloth dipped in Renaissance wax.