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UV–Vis Spectroscopy of Conjugated Systems01:32

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Related Experiment Video

Updated: May 11, 2026

Excitation-Scanning Hyperspectral Imaging Microscopy to Efficiently Discriminate Fluorescence Signals
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Objective color classification of ecstasy tablets by hyperspectral imaging.

Gerda Edelman1, Martin Lopatka, Maurice Aalders

  • 1Department of Biomedical Engineering & Physics, Academic Medical Center, University of Amsterdam, P.O. Box 22700, 1100 DE, Amsterdam, The Netherlands. g.j.edelman@amc.uva.nl

Journal of Forensic Sciences
|May 21, 2013
PubMed
Summary

This study introduces objective color analysis for ecstasy tablets using hyperspectral imaging. This method accurately identifies colorants and estimates their concentration, aiding in forensic investigations.

Keywords:
Kubelka-MunkXTCcolor measurementecstasyforensic sciencehyperspectral imagingillicit drugstablets

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Area of Science:

  • Forensic Science
  • Analytical Chemistry
  • Spectroscopy

Background:

  • Ecstasy tablet profiling traditionally relies on subjective color descriptions.
  • Objective, quantitative color analysis is needed for reliable forensic comparison.

Purpose of the Study:

  • To provide objective, quantitative color information for ecstasy tablets using visible hyperspectral imaging.
  • To determine colorant identity and estimate concentration in ecstasy tablets.

Main Methods:

  • Visible hyperspectral imaging was used to acquire reflectance spectra from ecstasy tablets.
  • Colorant identification was performed by comparing derived spectra to known standards.
  • Colorant concentration was estimated using a photon propagation model.

Main Results:

  • Hyperspectral imaging successfully identified the most likely colorant in most analyzed tablets.
  • Estimated colorant concentrations showed a high correlation with actual values (R(2) = 0.9374).

Conclusions:

  • Objective color information from hyperspectral imaging enhances ecstasy tablet profiling.
  • This technique, combined with other analyses, can significantly aid in comparing tablet seizures and determining their origin.