In China's traditional skills, what kind of leaves are used to polish sand leaves?

Rough-leaved tree is also called beef tendon tree, Ulmaceae. The leaves of the rough-leaved tree are very rough, which can be made into frosted paper to grind wood. Because of this feature, touching the texture of leaves with your hands is one of the ways to distinguish this tree species easily. The surface of dry leaves is rough, which is used for friction of copper, tin and tooth angle.