The bleach is used to bleaching by boiling with hydrogen peroxide concentrated 50% and sodium silicate in the ratio of hydrogen - peroxide, 10%, 5% sodium silicate of pulp weight after boil with caustic soda. 100 grams of hydrogen peroxide , sodium silicate, 50 g in weight after boiled pulp is used to produce 1 kilogram put into the water used to boil for about five liters of water when hot but not boiling. The observation of water vapor begins to float on the surface of the water and cries. The addition of hydrogen peroxide into the timber and stir to dissolve, then add the sodium silicate into it. Then use a stir together melted. Put the pulp into timber at temperatures around 80-90 degrees Celsius, the boiling time of about 20-30 minutes . Boiled using a wooden stir flip it to pulp. To get in touch and get a thorough purification chemicals in bleaching.