Tofu skin, yuba, bean curd skin, bean curd sheet, or bean curd robes, is a food product made from soybeans. During the boiling of soy milk, in an open shallow pan, a film or skin forms on the liquid surface. The films are collected and dried into yellowish sheets known as tofu skin. Since tofu skin is not produced using a coagulant, it is not technically a proper tofu; however, it does have similar texture and flavor to some tofu products. Tofu skin's use was first documented in written records in China, Korea, and Japan in the sixteenth century. It is widely used, fresh, fermented, or dried, in Chinese, Korean, and Japanese cuisine.