The transparent bean curd skin is called oil skin. Bean curd skin, also known as bean skin, oil skin, hundred pieces, rotten clothes. It is a bean product made of soybean after grinding and boiling, and belongs to the derivative food of tofu. Its skin is thin and transparent, semi-circular but not broken, yellow and shiny, soft but not sticky, smooth surface and unique flavor. It is a nutritious food with high protein, low fat and no cholesterol.