The bleach is used to bleaching by boiled with hydrogen peroxide and sodium silicate. When hot water but not boil the observation of water vapor is float on the surface of the water. Then, add hydrogen peroxide and stir to dissolve after that, add the sodium silicate into it. After, stir together melted. Put the pulp into it at temperatures around 80-90 degrees Celsius. the boil time of 10,20,30,40,50 minutes,and 1 hour. Boil and flip to pulp. To get in contact and get a thorough purification chemicals in bleaching.