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Replacing Synperonic® N in the physical developer fingermark visualisation process: Pseudo-operational trial and

Emily M Cartledge1, Zi Ying Guo2, Stephen M Bleay3

  • 1Defence Science and Technology Laboratory (Dstl), Porton Down SP4 0JQ, UK.

Forensic Science International
|July 29, 2021
PubMed
Summary

A new physical developer (PD) formulation using decaethylene glycol monododecyl ether (DGME) effectively replaces Synperonic® N for developing latent fingerprints on porous surfaces. This DGME-based PD is suitable for operational forensic laboratories.

Keywords:
Decaethylene glycol monododecyl ether (DGME), Pseudo-operational trial, Wetted surfacesFingermarkPhysical developer (PD)Synperonic® N

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Area of Science:

  • Forensic Science
  • Chemistry
  • Analytical Chemistry

Background:

  • Environmental concerns necessitate replacing Synperonic® N in physical developer (PD) solutions.
  • Previous laboratory trials showed promise for a new PD formulation with planted fingermarks.
  • Real-world sample performance of PD reagents requires validation beyond laboratory settings.

Purpose of the Study:

  • To evaluate the effectiveness of a decaethylene glycol monododecyl ether (DGME)-based physical developer (PD) formulation.
  • To assess DGME-based PD performance on naturally handled porous substrates in a pseudo-operational trial.
  • To determine DGME-based PD suitability as a sequential treatment following amino acid reagents.

Main Methods:

  • A pseudo-operational trial processed over 600 naturally handled porous samples.
  • Samples were previously treated with amino acid reagents: 1,2-indandione (IND), 1,8-diazafluoren-9-one (DFO), or ninhydrin.
  • Planted mark studies investigated DGME-PD formulation parameters: preparation, processing, storage temperature, and shelf life, including effectiveness on previously wetted items.

Main Results:

  • The DGME-based PD formulation proved effective on over 600 real-world porous samples.
  • DGME demonstrated efficacy as a sequential treatment, enhancing fingerprint development.
  • Formulation studies confirmed DGME-PD suitability for operational laboratory use, including stability and performance on wet samples.

Conclusions:

  • Decaethylene glycol monododecyl ether (DGME) is an effective and suitable replacement detergent for Synperonic® N in physical developer solutions.
  • The DGME-based PD formulation is validated for operational forensic laboratory use.
  • Utilizing PD as a sequential treatment offers added benefits for latent fingerprint development.