Detection of bodily fluids within fingermark impressions provides a valuable dual source of forensic evidence, combining biometric and biological information. In this study, attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy was applied to detect saliva and blood in fingermark impressions and to evaluate factors influencing detection. Optimization was performed using impressions from two donors (one male, one female), with controlled sebum deposition achieved by varying the number of forehead rubs (1, 5, 10, and 15). Fingermark features were visible across all conditions, but the clearest ridge detail was obtained with 15 rubs. To minimize variability, the force applied during impression generation was carefully controlled and kept constant across all experiments. The effect of fluid deposition and drying was then assessed by allowing saliva and blood to dry on the fingertip for 0, 10, 20, 30, 40, and 50 seconds prior to impression. ATR-FTIR spectra revealed fluid-specific signatures and demonstrated how drying time influenced detection sensitivity. These preliminary results establish critical parameters for optimizing ATR-FTIR detection of dried bodily fluids in fingermarks and provide insights into its potential application at crime scenes.