Call it CSI : Abracadabra . A camera that can make invisible substance re-emerge as if by thaumaturgy could admit forensics team to quickly skim a crime tantrum for blood stains without tampering with valuable evidence .
The prototype photographic camera , developed byStephen Morgan , Michael Myrick and co-worker at the University of South Carolina in Columbia , can discover origin stains even when the sample has been diluted to one part per 100 .
At present , profligate stain are detected using the chemic luminol , which is sprayed around the crime scene and reacts with the iron in any blood line present to utter a risque glow that can be seen in the dark . However , luminol is toxic , can stretch blood samples to a level at which DNA is unmanageable to go back , and can smearblood spattering patternsthat forensic experts use to help oneself determine how the victim died . Luminol can also react with substances like bleach , rust , fizzy drink and coffee , get it to bring out false positive .
The television camera , in direct contrast , can distinguish between blood and all four of these substance , and could be used to spot stains that require further chemical analytic thinking without interfering with the sampling .
To take an figure of speech of a scene , the camera beams pulses of infrared light onto a open and detects the infrared emission that is think over back off it . A guileless , 8 - micrometre - thick layer of the protein albumin placed in front of the detector roleplay as a filter , shit a diluted line of descent stain show up against its surroundings by permeate out wavelengths that are n’t characteristic of blood protein .
By modifying the chemical substance used for the filter , it should be potential to detect contrast between a surface and any type of stain , says Morgan . “ With the appropriate filter , it should be possible to detect [ sudor and lipids ] in fingerprint that are not visible to the nude eye , ” he says . “ In the same way you could also detect drugs on a surface , or trace explosives . ”
Journal book of facts : Analytical Chemistry , DOI : 10.1021 / ac101107v
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