How to develop latent fingerprints on all kinds of paper evidence by Non Destructive Test
It is used widely using Ninhydrin such tranditional way to detect latent fingerprints, but for the tissue paper such loose structure papers, Ninhydrin cannot do, so how to get the latent fingerprints?
1, Not need chemical reagent, not pollute the paper.
2, Even the tissue paper, detect latent fingerprints on paper is not a problem
3, detect fingerprints on paper, at them same time help extract DNA.
4, the fingerprints can be completely manifested, without missing parts, even if the fingerprints with a little sweat can be visible
5, it will be better if we could see the fingerprints on paper by naked eyes under natual light.
Here I introduce an forensic infrared system: OR-GHS100, which used to manifest the sweat fingerprints on all kinds of paper material.
VIDEO(napkin paper for test) as below for reference:
the system have two ways to detect fingerpirnts :
A．After treatment by infrared system(needs 15minutes), fingerprints are manifested under laser irradiation, with which method the DNA can be extracted without DNA destruction.
B．After treatment by infrared system(needs 25minutes), fingerprints can be seen directly under natural light, with which method that the DNA will be destructed 30-40%, about 60% will not be destructed.