Patina is a professional term in the antique industry, referring to the oxide layer formed on the surface of cultural relics due to long-term oxidation. "Patina" is actually "luster", which specifically refers to the natural luster formed on the surface of antiques after a long time. Not only porcelain, wood, jade, bronze, ivory carvings, cultural relics, calligraphy and painting, stone tablets and other paper and silk products have patina.

Patina is the surface skin that is gradually formed by dust, sweat, hand stains of the player, or soil burial and water infiltration, long-term rubbing, and even the penetration of rays in the air, layer by layer. It is smooth and pleasing, with a quiet light, telling people that this thing has an age and reveals a warm old air. That is exactly in contrast to the dazzling "thief light", impetuous color, and dry texture of the new goods just out of the oven.