Visualization and enhancement of latent fingerprints using low pressure dye vapor deposition

摘要

Methods and apparatus for the recovery, visualization and enhancement of latent fingerprints using Low Pressure Dye Vapor Deposition (LPDVD) are described. The LPDVD methods of the present invention provide for fine control over the deposition of a precursor in combination with a fluorescent dye, combination of dyes or a premixed dry solid compound of the precursor and dyestuffs, to make the latent fingerprints visible. The LPDVD process makes use of a heated carrier gas to dilute and carry the vapors into a vacuum chamber where they condense onto the exposed surfaces of the article being developed. The LPDVD process can be used to develop latent fingerprints on a wide variety of substrates, including metal, plastic, glass and thermal paper and has been shown to perform as well or better than conventional fingerprint development techniques on these surfaces.