1. the process of forming or developing a patina on a surface, especially on metal or stone
Usage: commonly used in art, archaeology, and conservation contexts
2. the patina itself; a thin layer that forms on the surface of metal, stone, or other materials over time
Usage: less common usage; patina is the preferred term for the layer itself

Examples

• The patination of the bronze sculpture took decades to achieve its distinctive green color.
• Conservators study the patination process to understand how ancient artifacts have aged.
• The artist accelerated the patination of the metal surface using chemical treatments.
• Natural patination gives old coins their characteristic appearance.
• The patination on the copper roof protected the underlying metal from further corrosion.