NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.
Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.
An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Strategies for Potential Age Dating of Fingerprints through the Diffusion of Sebum Molecules on a Non-porous Surface
Published
Author(s)
Shinichiro Muramoto, Edward Sisco
Abstract
Age dating of fingerprints can have a significant impact in forensic science, as it has the potential to facilitate the judicial process by assessing the relevance of a fingerprint found in a crime scene. However, no reliable method currently exists that can reliably predict the age of a latent fingerprint. In this manuscript, time-of-flight secondary ion imaging mass spectrometry (ToF-SIMS) was used to measure the diffusivity of squalene and fatty acid molecules from a fingerprint on a silicon wafer. It was found that their diffusion from relatively fresh fingerprints (t ≤ 96 hrs) could be modeled using an error function, with diffusivities (mm2/hr) that followed a power function when plotted against molecular weight. The equation x=0.02〖 t 〗^0.5 was obtained for palmitic acid that could be used to find its position in mm (where the concentration is 50% of its initial value, or c0/2) as a function of time in t hrs.
Muramoto, S.
and Sisco, E.
(2015),
Strategies for Potential Age Dating of Fingerprints through the Diffusion of Sebum Molecules on a Non-porous Surface, Analytical Chemistry, [online], https://doi.org/10.1021/acs.analchem.5b02018
(Accessed October 9, 2025)