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Related Experiment Video

Updated: Jun 4, 2026

Detection and Removal of Tooth-Colored Composite Resin Using the Fluorescence-Aided Identification Technique

Detection and Removal of Tooth-Colored Composite Resin Using the Fluorescence-Aided Identification Technique

Published on: July 27, 2022

Visualizing latent fingerprints on color-printed papers using ultraviolet fluorescence.

Norimitsu Akiba¹, Naoki Saitoh, Kenro Kuroki

¹Physics Section, Second Forensic Science Division, National Research Institute of Police Science, 6-3-1 Kashiwanoha, Kashiwa, Chiba 277-0882, Japan. akiba@nrips.go.jp

Journal of Forensic Sciences

|March 3, 2011

Summary

This study demonstrates laser-induced fluorescence for detecting latent fingerprints on color-printed paper. Optimal imaging conditions were identified using specific laser excitation wavelengths and time-resolved techniques.

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Multicolor Fluorescence Detection for Droplet Microfluidics Using Optical Fibers

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Published on: May 5, 2016

Area of Science:

Forensic Science
Optics and Photonics
Analytical Chemistry

Background:

Latent fingerprint detection on various surfaces is crucial in forensic science.
Previous methods for fingerprint detection on paper have limitations, especially on colored or printed documents.
Understanding the fluorescence properties of printer inks and toners is key to developing advanced imaging techniques.

Purpose of the Study:

To investigate the feasibility of using laser-induced ultraviolet (UV) fluorescence for latent fingerprint detection on color-printed white paper.
To measure and analyze the UV fluorescence characteristics of toners and inks from various home printers.
To optimize imaging parameters, including excitation wavelengths and detection methods, for clear fingerprint visualization.

Main Methods:

Utilized a nanosecond pulsed tunable laser system for excitation at 230 nm and 280 nm.
Employed a cooled CCD camera for fluorescence imaging.
Tested fourteen different printers (color/monochrome laser printers, inkjet printers, copy machines).
Applied time-resolved imaging with a band-pass filter for enhanced image clarity.

Main Results:

Most printer toners and inks exhibited fluorescence between 360 nm and 550 nm.
Clear fluorescence fingerprint images were generally obtained using 280-nm excitation and time-resolved imaging.
230-nm excitation provided superior results for toners from color laser printers with strong fluorescence.
Successful fingerprint imaging was demonstrated on both photographic and text pages.

Conclusions:

Laser-induced UV fluorescence is a viable technique for latent fingerprint detection on color-printed paper.
The choice of excitation wavelength (230 nm vs. 280 nm) is critical and depends on the specific toner/ink fluorescence properties.
Time-resolved imaging enhances the quality of fluorescence fingerprint detection, offering a promising forensic tool.