A new latent fingerprint method using natural powder purple sweet potato (Ipomoea batatas L. Poiret)

Fingerprint is one of human identity which cannot be changed or changed. In
addition, it is also from a fingerprint that someone can be recognized. Several
development methods can visualize latent fingerprints using natural ingredients. This
study was aimed to develop the purple sweet potato powder method as a
visualization of latent fingerprints. The purple sweet potato powder method was
developed on five media, namely: aluminum foil, transparent plastic, plastic cups,
CDs, and white paper. The development was carried out on a purple sweet potato
tuber by applying purple sweet potato powder to a media that previously had the
sebum content of a fingerprint. Purple sweet potato powder used were several kind
of sizes between 60 to 200 mesh. This research was carried out in the INAFIS regional
police laboratory. The results of fingerprint purple sweet potato powder was formed
brownish purple and with clear color contrast at sizes 100 and 200 mesh. The shape
of the fingerprint pattern obtained from the sample has the following patterns: radial
loop (11.6%), ulnair loop (44.1%), plain whorl (33.3%) twinted loop and arch (0.8%).
In this method visualization was clearly visible on the surface of aluminum foil and
CD. The results of the determination of latent fingerprint visualization between tribes
and blood groups were the most common patterns found are ulnair loop fingerprint
patterns.