Boiling, Kurotani paper

The white root bark of the paper mulberry is again left immersed in the water for two days and nights before boiling. This further increases the beauty of the material. Next is the boiling, in which soda ash is poured into the boiling water in the cauldron before the paper mulberry is added while being stirred. The softened material is rinsed in water to remove lye and small dust particles.