All kinds of bronze rusts adhered unto the surface are formed layer by layer, which results in a tight and strong structure uneasy to peel off. Surface layers and bronze rusts of the bronze objects differ from one area to another. According to the unearthed bronzes, the surface layers of the bronzes in dry areas preserve better, dissolution of bronze nature is less and rust change is not complicated. However, those bronzes unearthed from Lo Yang and ruins of the Shang dynasty, as a whole, are not preserved well with many layers of bronze rusts as well as complicated resolution of bronze character. Humid places suck as the Yangtze River area have an extremely serious erosion phenomenon.
Some bronzes even have only one finely thin layer left.
This kind of situation is called semi-bodiless or bodiless. Under this type of circumstance, bronzes are difficult to preserve. Bronzes are alloys of copper, tin and lead. Striped or spotted streaks appear on the surfaces of the bronze objects after mineralization underground for a long period of time. There is absolutely no doubt about those bronzes with obvious streaks on the surfaces because fake bronzes can never have such patterns.