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Improvement in Latent Fingermark Detection on Thermal Paper using 5,6-Dimethoxy-1,2-indandione/PVP

A new method for improvement of 1,2-indandione-treated latent fingermarks on thermal paper will be described in this paper. Treatment with conventional techniques like ninhydrin in petroleum ether or DFO solution produces a black color on the thermosensitive side of thermal paper.
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