the band at 1000 cm−1 is assigned to skeletal CC vibrations, while the band at 704 cm−1 refers to C-S stretching. Regardless of color, pristine PCFFs possess a broad amide band at 1655 cm−1 caused by the C-O stretching in the amide group. A broad amide band at 1530 cm−1 arising from N-H bending and C-N stretching vibrations appear at the same time on the protein backbone. A small amide band that occur around 1270 cm−1 is due to C-N stretching and N-H bending in majority as well as to CC stretching and C-O in plane bending in minority. Generally speaking, amide bands hold clue as to how the protein conformation and backbone structure of PCFFs evolve due to an external thermal reasoning involved. It is possible to qualitatively determine the strength and the length of hydrogen bonds from the location of the FTIR bands. Among all the amide bands, 1655 cm−1 indicates best the richness of -helix conformation in the keratin matrix.