Small Particle Reagent forms what color deposit upon application?

Small Particle Reagent (SPR) is specifically used in forensic science to enhance latent fingerprints on non-porous surfaces, such as glass or plastic. When SPR is applied to these surfaces, it binds to the sweat and oils present in the latent prints, resulting in the formation of a visible deposit. The deposit color that typically forms is gray. This gray coloration occurs because the particles are composed of a combination of various materials that interact and aggregate upon application, which produces the characteristic color that allows forensic examiners to visualize the previously hidden prints.

Understanding this process is essential for forensic professionals, as it informs the appropriate methodologies and techniques to recover prints effectively from different types of surfaces.