This uses a natural process and even if it only leads to a small increase in success rate, then that would be significant,' he added.

Using advanced surface imaging techniques, such as an atomic force microscope, nanoscale observations of finger printed brass samples can identify optimum conditions to promote the natural enhancement of the fingerprint, vastly improving their recovery rate.

It has also been proven that components of the sweat deposit survive washing and wiping of the surface, said a University of Leicester release.