Visualising latent fingerprints on thermal paper using a heater

摘要

Apparatus for applying a spatially and temporally uniform heat source to thermal paper (D) is disclosed. The source may be provided beneath a hot plate (A). The apparatus enables latent fingerprints deposited on the paper to be generated. Visualization can be enhanced by the use of a blue LED light source (F) of 395 nm peak wavelength. The light sources may be provided in the housing (E) of the apparatus.