Which types of fingerprints are known to fluoresce under specific illumination conditions?

The correct answer highlights that natural latent fingerprints and some environmental contaminations can fluoresce under specific illumination conditions, such as when exposed to certain wavelengths of light, such as ultraviolet (UV) or laser light.

Natural latent fingerprints contain oily or moist residues left by the secretions from the skin, which can exhibit fluorescence due to their chemical composition. Various types of contaminants found in the environment—such as bodily fluids, certain oils, and other substances—can also fluoresce under specific lighting conditions. This characteristic is particularly useful in forensic investigations, as it can aid in both the detection and examination of latent fingerprints that would otherwise be difficult to see.

The other options do not encompass the full range of fluorescence phenomena observed in fingerprints. For example, claiming that only latent fingerprints fluoresce ignores the role of environmental contaminants. Although nonporous surfaces may retain prints more effectively, this does not directly pertain to their ability to fluoresce. Understanding these nuances reinforces the importance of considering both the physiological composition of fingerprints and the influence of environmental elements in forensic analysis.