Evaluation of the performance of IND/Zn and DFO on various porous substrates in Singapore context

Enhancement of latent fingermarks found at crime scenes can be crucial to criminal investigations. This study looks at the effectiveness of ninhydrin analogues 1,2-indanedione (IND/Zn) and 1,8-diazafluoren-9-one (DFO) for such operational use. Using fingermarks deposits from seven donors, tests were done on seven substrates commonly encountered in local crimes - plain A4 paper, glossy magazine, paper magazine, brown envelopes, white envelopes, cardboard, and joss paper. Findings show that 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.
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