Microscopic imaging techniques were also tried to check the enhancement under different imaging conditions. Both the sides of the fingerprint mark with and without the deposited CTF were viewed using the optical microscope (Olympus BX 51) in reflection mode under both bright and dark fields modes under 5× magnification. It should be noted that we can only see a small field of the fingermark under the microscope and it was attempted to find regions with the most visible marks, particularly for the plain fingermarks without CTF deposition. In Fig. 3, we show the microscopic images of the fingerprints on a glass slide: (a) and (b) are bright-field images while (c) and (d) are the dark-field images. The fingerprint debris on the glass slide can be discerned in the plain fingerprint marks (b and d), the CTF deposition in (a) and (c) clearly enhances the visibility of the fingerprints. The scattering nature of the CTF appears to make imaging using dark-field techniques which only images the scattered light most suitable for smooth substrates with minimal scattering.