Transcript Latent Prints

Latent Prints
Invisible prints
 Produced due to oils from skin
 Circumstantial, Physical, associative
individual evidence
 Need special lighting or chemical
processing to view
 Can be lifted
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Best surface for the formation of a
latent prints:
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Hard and nonporous surface
 Glass
 Plastic
 Formica
 Smooth
metal
 Finished wood
Chemically Detecting Finger prints
Cyanoacrylate (super glue), bind to amino
acids and forms a white print, uses fuming
chamber
Ninhydrin (triketohydrindenehydrate), dip or
spray, takes several hours to develop,
forms a blue/purple print, heating speeds
process
Silvernitrate, reacts with NaCl in print to
form a blackish print when exposed to
light
Other Prints
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Patent Prints: prints formed from a
substance on the hands like blood,
paint,ink etc, These prints are visible.
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Plastic Prints: prints made in a soft
substance like clay, soap, etc. These prints
are 3D.
Points of Minutiae:
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Crossover
Core
Bifurcation
Ridge ending
Island
Delta
Pore
enclosure
Name the type of points of
minutiae:
Fingerprints…. Why are they useful in
Forensics?
All individuals have different prints
 Each individual has 10 different prints
 Prints remain the same through out
lifetime
 Prints can be classified into 9 basic types
 Points of minutia can be identified
 AFIS has been established
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