What fine particles is Small Particle Reagent composed of?

Small Particle Reagent (SPR) is primarily composed of molybdenum disulfide, which is a fine particle that effectively enhances and visualizes latent fingerprints on a variety of surfaces, particularly non-porous materials such as plastic and glass. Molybdenum disulfide is known for its properties that allow it to adhere to the sweat and oils left behind in fingerprints, allowing for successful visualization under light.

Other materials in the choices may have their own uses in forensic science or fingerprint analysis but do not serve the same purpose or composition as Small Particle Reagent. For instance, aerosil is typically used as a thickening agent or carrier in other applications, silica gel is commonly used for moisture absorption, and graphite is used for powdering fingerprint patterns. However, it is molybdenum disulfide that is specifically effective in fingerprint recovery using the SPR method due to its unique adherence and visual enhancement qualities.