Fourier Transform infrared (FTIR) and Raman (FT-Raman) spectroscopy have produced a degree of spectral detail which appears to improve upon that available from existing studies. This has been achieved mainly by the successful elimination of fluorescence from natural tissue and synthetic materials, a problem which has obdurated the Raman analysis. Both techniques provide information on molecular vibrations and complement each other. It is shown that the FT-Raman spectroscopy is an ideal technique to study high fluorescence possessing synthetic materials, such as, poly(ether-ether) ketone. Both FTIR and FTR techniques are complementary to each other rather than contradictory.