Latent Fingerprint Development on Thermal Paper Using Traditional Ninhydrin and 1,2-indanedione

• Chun-Chieh Chen ^[3] ; Yung-Chien Yu ^[4] ; Henry C. Lee ^[1] ; Yun-Seng Giang ^[2] ; Sheng-Meng Wang ^[2]
  1. [1] University of New Haven

     University of New Haven

     Town of West Haven, Estados Unidos

     
  2. [2] Central Police University

     Central Police University

     Taoyuan District, Taiwán

     
  3. [3] Changhua County Police Bureau Forensic Science Section Changhua City Taiwan
  4. [4] Criminal Investigation Bureau Forensic Science Center Taipei Taiwan

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• Localización: Journal of forensic sciences, ISSN-e 1556-4029, ISSN 0022-1198, Vol. 61, Nº. 1, 2016, págs. 219-225
• Idioma: inglés
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• Resumen

  • Thermal paper poses a significant challenge to latent print development as it tends to change color when traditional fingerprint development formulations are applied to it. In this study, the optimal components of ninhydrin, 1,2-indanedione, 1,8-diazafluoren-9-one (DFO), and 5-methylthioninhydrin (5-MTN) for yielding clear fingerprints on thermal paper were determined by systematically adjusting the relative amounts of the reagents, polar solvents, and the nonpolar diluent petroleum ether, followed by validation on text-printed thermal paper. Specifically, 3.0% ethyl acetate as the polar solvent in petroleum ether was found to be the optimal combination; the optimal dilution ratios of ninhydrin, DFO, and 5-MTN original solutions with petroleum ether were 1 to 2, 11, and 7, respectively. The optimal concentration of 1,2-indanedione in petroleum ether was 0.125 g/L, with a string of 0.5% ethyl acetate in petroleum ether.