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Evaluation of the performance of IND/Zn and DFO on various porous substrates in Singapore context
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Evaluation of the performance of IND/Zn and DFO on various porous substrates in Singapore context
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Journal Article
Evaluation of the performance of IND/Zn and DFO on various porous substrates in Singapore context
2020
Overview
•IND/Zn outperforms DFO in a tropical climate with high temperature and humidity.•IND/Zn consistently outperforms DFO on fingermarks aged up to 3 months.•IND/Zn performs better than DFO on a range of substrates, including joss paper.•IND/Zn appears to be more sensitive than DFO.
Enhancement of latent fingermarks found at crime scenes can be crucial to criminal investigations. The performance of ninhydrin analogues 1,2-indanedione (IND/Zn) and 1,8-diazafluoren-9-one (DFO) used in laboratories for the enhancement of latent fingermarks on porous substrates were compared for operational use. The visualisation of enhanced latent fingermarks on seven substrates commonly encountered in local crimes - plain A4 paper, glossy magazine, paper magazine, brown envelopes, white envelopes, cardboard, and joss paper were assessed using fingermarks deposits from seven donors. Fingermarks were aged under both indoor and outdoor conditions as well as over different periods of time. Our results show that IND/Zn consistently produced fingermarks of superior quality and contrast to DFO across the different donors, substrates and time periods. IND/Zn also appears to be more sensitive compared to DFO.
