3 Neutralizing
工業(yè)科技

3 Neutralizing圖片（共6張） :

        Wet-blue is acid and develops acidity on standing. Under acid conditions the leather protein is cationic and this is further accentuated by the mineral retannage. Consequently negatively charged colloids,such as vegetable tans,amino-resins,dystuffs,fatliq......（本文共 8540 字, 6 張圖）     [閱讀本文] >>