8 Pickling and Depickling
工業(yè)科技

        8.1 Conventional Pickling Method Pickling refers to the treatment of the hide with salt and acid to bring the skin to the desired pH for either preservation or tanning. At the end of the pickling operation the skin is theoretically a purified network of h......（本文共 9026 字, 1 張圖）     [閱讀本文] >>