From this study, the best quality of developed
latent prints on wet non-porous surfaces in every type
of soaking solution was obtained from SPR II, which
contains molybdenum disulfide particles in 0.8% (v/v)
tergitol NP-7 (detergent), and 1.05% (w/v) choline
chloride, and the proportion of particles to detergent
of 13.1. The average number of ridge counts obtained
was 12.98 which is sufficient to allow identification
of a given individual from the fingerprint in a forensic
investigation, and the fingerprint image was nearly
complete (moderate, ++). When the composition of
SPR II, the best in this study, and SPR III, the best
formula in a previous study(3) were compared, it was
found that the type of particle (MoS2) and detergent
(tergitol NP-7) were similar, as were the percentages
of particles, detergent and the proportion of particle to
detergent. The main difference between these two
formulae then was the addition of 0.4% (w/v) choline
chloride to SPR II. It is plausable then that the higher
number of ridge counts in the developed latent print
obtained from SPR II (12.98) compared to those
detected with SPR III (10.25) is due to the presence of
choline chloride.
From this study, the best quality of developed
latent prints on wet non-porous surfaces in every type
of soaking solution was obtained from SPR II, which
contains molybdenum disulfide particles in 0.8% (v/v)
tergitol NP-7 (detergent), and 1.05% (w/v) choline
chloride, and the proportion of particles to detergent
of 13.1. The average number of ridge counts obtained
was 12.98 which is sufficient to allow identification
of a given individual from the fingerprint in a forensic
investigation, and the fingerprint image was nearly
complete (moderate, ++). When the composition of
SPR II, the best in this study, and SPR III, the best
formula in a previous study(3) were compared, it was
found that the type of particle (MoS2) and detergent
(tergitol NP-7) were similar, as were the percentages
of particles, detergent and the proportion of particle to
detergent. The main difference between these two
formulae then was the addition of 0.4% (w/v) choline
chloride to SPR II. It is plausable then that the higher
number of ridge counts in the developed latent print
obtained from SPR II (12.98) compared to those
detected with SPR III (10.25) is due to the presence of
choline chloride.
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