The most significant peak intensity, which continually increases with alkali and bleaching treatment, and also in the subsequent size reduction treatments is 891 cm−1, which corresponds to the C–H glycosidic deformation, with a ring vibration contribution and the O–H bending. These features are characteristic of the β-glycosidic bond between the anhydroglucose units of the cellulose units that appears in all of the fibers. This band is also known as the amorphous band [27]