Which latent print development technique is used specifically to process nonporous materials that are wet?

Small Particle Reagent (SPR) is specifically designed for developing latent prints on nonporous surfaces, particularly in situations where the surfaces may be wet or oily. This technique involves the use of a suspension of tiny particles that adhere to the latent print residue left by the fingers. The particles are effective at bonding with the oils and other contaminants found in the latent print, allowing for clear visualization against the background surface. This is especially useful on surfaces such as glass, plastic, or metal, which do not naturally absorb moisture or oils.

The other techniques mentioned are not as suitable for wet nonporous surfaces. Fluorescence Examination can be a useful method for detecting certain substances but does not specifically target wet conditions or nonporous materials as effectively as SPR. Ninhydrin is primarily used for porous materials, reacting with amino acids in sweat to develop prints, making it ineffective for nonporous items. Gentian Violet is typically used for processing latent prints on porous materials such as paper, where the dye can effectively penetrate and reveal prints but is not applicable to wet nonporous surfaces like glass or metal.

In summary, SPR stands out as the best choice for developing latent prints on wet nonporous materials due to its specialized formulation and operational