We work with copper, zinc, and terne coated stainless steel exclusively. These are naturally non corroding metals which are protected from the environment by their own beneficial chemistry, and hence achieve a service life far beyond that of painted or galvanized metals. These metals are also infinitely recyclable with no loss of quality. Everyone is familiar with the green patina of aged copper; zinc and terne start out a bright silver, and age to a dull blue grey. Zinc is available in pre patina versions, and in a range of colors as well. We would be happy to send you samples of each.