the surfactant solution. 20 individuals, both males and females,
with variable donor capabilities, were asked for their consented
groomed fingerprints for the study.
Latent fingerprints were developed on metallic spoon, aluminium
foil and glass slide simulating metal body firearms,
knives, door knobs, bottles etc. where there is higher probability
of culprit leaving chance impressions. The fingerprints were
impinged on selected non-porous surfaces. These were
immersed in clean water for 45 days and their development
through SPR composition was done every day. The experiment
was conducted in summer season in Delhi, India when the temperature
was 40–43 C and relative humidity was 26–34%.
For evaluating shelf life, the composition was stored in
glass beaker covered with an aluminium foil under ambient