What is critical for the selection of methods in latent print examination?

The selection of methods in latent print examination fundamentally relies on the substrate of the surface. Different surfaces interact uniquely with latent prints and can significantly affect the visibility and development of those prints. For example, porous surfaces like paper absorb moisture and oils, which can change the way prints are revealed, whereas non-porous surfaces like glass or plastic might allow for more straightforward development using powders or chemical methods.

When examining latent prints, understanding the substrate helps in choosing the appropriate technique for enhancement. Some methods work better on certain materials; for instance, superglue fuming for non-porous surfaces or chemical baths for porous substrates. Therefore, knowledge of the substrate is essential for successful print recovery and analysis in forensic examinations. This focus on the surface allows for optimal results in identifying and analyzing latent prints.