Patination refers to the process of creating a natural layer on metals or other materials through the application of chemicals or environmental factors. Synonyms for patination include oxidization, corrosion, rusting, tarnishing, or weathering. Oxidization, specifically, refers to the process of reacting with oxygen to create a new substance. Corrosion suggests a gradual decay or wearing away due to chemical reactions. Rusting refers to the formation of rust on iron or steel. Tarnishing refers to the reaction of metals with air and water, leading to discoloration. Weathering implies a natural transformation of the object due to exposure to the elements. All of these synonyms describe the transformation of materials through exposure to their environment.