Despite the vast quantity of fingerprint treatments currently available, examiners continue to be frustrated by a number of ‘difficult’ substrates.
Multi-coloured and densely patterned backgrounds, reflective metal surfaces and substrates that fluoresce at the same
wavelengths as common fluorescent fingerprint treatments, can prevent the successful imaging of fingerprints.
However, when dusted with fpNATURAL IR fluorescent powders, interference can be removed to reveal high contrast prints.
fpNATURAL 1 & 2 powders emit bright fluorescence in the infrared region of the spectrum; fpNATURAL1 is excited by red or blue illumination, fpNATURAL 2 is excited by near-IR illumination.
Visualisation of both powders is achieved using an IR sensitive camera equipped with an IR pass filter to block out all other wavelengths.
Visualising Fingermarks on Polymer Banknotes
Traditional methods of examining paper banknotes, using a combination of wet-chemical treatments and forensic light sources, are less suitable for the new generation of polymer banknotes.
Trials conducted using fpNATURAL1 and 2 powders have been highly successful, with high quality fingerprints being revealed on a wide range of polymer banknotes.