The bands at 460 and 670 nm are both attributed to lignin and chlorophyll structures, including conjugated π-bond system chromophores. Other bands appear at 1170 nm (2nd overtone of C―H stretch of lignin structures), 1434–1470 nm (assigned to 1st overtone of O―H stretch of structures of polysaccharides of OH groups with H-bonds) and 1724 nm (with two overlaps, assignment to C―H stretch of 1st overtone of CH2 of lignin or than of CH of furanose or pyranose due to hemicellulose). The band at 1920 nm is probably assigned to O―H stretch and OH bend of polysaccharides structures which overlaps with water. Above 2000 nm, there are the combinations bands, at 2090 (O―H combination band of carbohydrates) and 2329 nm attributed to C―H stretch or C―H combination band of polysaccharides [22–27].