Finally, we examined the possibility of detecting larger areas of the fingerprints by illuminating with 532 nm DPSS laser (100 mW) beam and imaging the fluorescence by a CCD camera through a 532 nm notch filter. The fluorescence from the Rhodamine 6G treated CTF deposited fingerprint marks stand out prominently on both the rough aluminum surfaces as well on the smooth glass surface (see Fig. 7). To prevent saturating the CCD camera the laser beam was attenuated to 5% for the Rhodamine 6G treated samples by using neutral density filters. The alanine + 1,2-indanedione samples show comparatively poor fluorescence and the laser intensity had to be enhanced by using a ND filter with 13.5% transmittance. In that case, the transmission through the notch filter of the strong scattered light from the rough aluminum surface was almost comparable to the fluorescence from the 1,2-indanedione (see Fig. 7) and in case of the glass slide also, the fluorescence was very weak. Hence we opine that for detection purposes, the Rhodamine 6G treatment on the CTF is much more efficient than the alanine + 1,2-indanedione case.