Fig. 4. Latent fingerprints developed using the twelve-carbon chain derivative (0.01% w/v in dimethyl sulfoxide) followed by water rinse, then Ag-PD. a) On Whatman filter paper, left half processed with twelve-carbon derivative for 2 min then Ag- PD <5 s, right half with Ag-PD only 2 min. b) On Whatman filter paper, left half processed with twelve-carbon derivative for 2 min then Ag-PD <5 s, right half withcitrate-capped AuNPs (avg. diameter 60 nm, same concentration) for 2 min then Ag-PD<5 s c) On Whatman filter paper, left half processed with twelve-carbon derivative for 2 min then Ag-PD <5 s, right half paper pretreated with 2.5% w/v malic acid in water for 10 min then processed with twelve-carbon derivative for 2 min then Ag-PD <5 s d) On 100% cotton paper used for official documents (a.k.a. resume paper), >1 month old fingerprint, processed with the twelve-carbon chain derivative for 3 min,then Ag-PD <5 s.
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