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IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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Updated: Mar 9, 2026

HPLC Coupled with Chemical Fingerprinting for Multi-Pattern Recognition for Identifying the Authenticity of Clematidis Armandii Caulis
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1,2-Indanedione - A winning ticket for developing fingermarks: A validation study.

Michal Levin-Elad1, Yakir Liptz2, Karni L Bar-Or1

  • 1Latent Fingerprint Laboratory, Division of Identification and Forensic Science (DIFS), Israel police, National H.Q., Jerusalem, 9780204, Israel.

Forensic Science International
|December 25, 2016
PubMed
Summary
This summary is machine-generated.

1,2-Indanedione demonstrates superior performance in developing latent fingermarks on used train tickets compared to ninhydrin and DFO. This study introduces a new metric, the potential for fingermark development (PFD), to assess reagent sensitivity.

Keywords:
1,2-IndanedioneDFOFingermarks developmentLatent FingerprintsNinhydrinThermal paper

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Area of Science:

  • Forensic Science
  • Analytical Chemistry
  • Biochemistry

Background:

  • Amino acid-reactive reagents are crucial for latent fingermark detection.
  • 1,2-Indanedione, DFO, and ninhydrin are leading reagents for amino acid detection.
  • Used train tickets present a unique substrate for fingermark development due to their dual-layer composition.

Purpose of the Study:

  • To compare the efficacy of 1,2-indanedione, DFO, and ninhydrin for developing fingermarks on used train tickets.
  • To adapt traditional fingermark development procedures for thermally sensitive substrates.
  • To propose a new metric, the potential for fingermark development (PFD), for evaluating reagent sensitivity.

Main Methods:

  • A comparative study involving 1500 used train tickets treated with 1,2-indanedione, DFO, or ninhydrin.
  • Modified development procedure avoiding heat due to the thermal sensitivity of the ticket substrate, utilizing air-drying instead.
  • Evaluation of fingermark development based on comparable and partial marks, and introduction of the PFD metric.

Main Results:

  • 1,2-Indanedione showed superior performance in developing fingermarks compared to ninhydrin and DFO.
  • The modified air-drying method was effective in preventing substrate degradation.
  • The proposed PFD metric supported the observed superiority of 1,2-indanedione.

Conclusions:

  • 1,2-Indanedione is the most effective reagent for fingermark development on used train tickets among the tested reagents.
  • The PFD metric provides a valuable tool for assessing the sensitivity of fingermark development reagents.
  • Adaptation of development protocols is essential for unique forensic substrates.