Taking fleas and dried leaves of trees and straws, etc. from wool. Because water and materials that are commonly used for washing are not able to separate the materials learned from the wool, so it is used to wash the wool and thorns from strong acids such as “carbonide” or “sulfurik” with a certain percentage. It is also called “carbonizing wool,” which is coal-fired through waste materials. After the procedure, they will wash it out and dilute it with ammonia.