1|Page
IAI LATENT PRINT CERTIFICATION EXAM
QUESTIONS AND ANSWERS 2025
What sequence of latent print development techniques
are used to develop prints from porous materials? -
.....ANSWER ...✔✔ DFO, Ninhydrin, Physical
Developer
The final purple coloured compound usually produced
with the treatment of Ninhydrin - .....ANSWER ...✔✔
Ruhemann's Purple
What latent print development technique is used to
process nonporous materials that are wet? - .....ANSWER
...✔✔ Small Particle Reagent
A dye which stains protein present in blood to give a
blue-black product - .....ANSWER ...✔✔ Amido Black
The following types of fingerprints will fluoresce under
appropriate illumination - .....ANSWER ...✔✔ 1.
Natural latent fingerprints
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2. Some types of contamination arising from the
environment and subsequently deposited in fingerprints
May be one of the first processes used in a sequence of
a fingerprint examination - .....ANSWER ...✔✔
Fluorescence examination
Gentian violet is a dye which stains fatty constituents of
sebaceous sweat producing an intense purple image. It
is very effective for the development of latent
fingerprints on... - .....ANSWER ...✔✔ Adhesive
surface of adhesive tapes
Alternative process names for Gentian Violet -
.....ANSWER ...✔✔ 1. Crystal Violet
2. Methyl Violet
Alternative process name for Amido Black - .....ANSWER
...✔✔ Naphthalene Black
Iodine vapour is physically absorbed by latent
fingerprint deposits and often fades unless fixed. What
color image is formed using iodine vapour? -
.....ANSWER ...✔✔ Brown
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Gentian Violet can interfere with the forensic
examination for: - .....ANSWER ...✔✔ 1. Handwriting
2. Body fluids
3. Ink
Ninhydrin is a general purpose fingerprint reagent for
paper and some other porous surfaces. What
component of a fingerprint deposit does it react with? -
.....ANSWER ...✔✔ Amino Acids
How long does it generally take for Ninhydrin treated
prints to naturally, fully develop - .....ANSWER ...✔✔
Several weeks
The development of Ninhydrin treated prints may be
accelerated with the use of? - .....ANSWER ...✔✔
Heating and Humidification
Ninhydrin which uses a Freon solvent virtually eliminates
the following problem when processing porous materials
for latent prints? - .....ANSWER ...✔✔ Ink running
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Ninhydrin may be applied using what methods? -
.....ANSWER ...✔✔ 1. Dipping
2. Brushing
3. Spraying
Physical Developer (PD) is what kind of aqueous
reagent? - .....ANSWER ...✔✔ Silver-based
Physical Developer reacts with components of sebaceous
sweat to form what colored deposit? - .....ANSWER
...✔✔ Grey-silver
Physical Developer is a very effective reagent for
developing latent fingerprints on paper which has been:
- .....ANSWER ...✔✔ Wetted
These flake powders have been shown to be more
sensitive than most other types of powders - .....ANSWER
...✔✔ Aluminum
Which latent print development technique was replaced
by the Ninhydrin/Physical Developer combination for
treating porous materials for latent prints? - .....ANSWER
...✔✔ Silver Nitrate
IAI LATENT PRINT CERTIFICATION EXAM
QUESTIONS AND ANSWERS 2025
What sequence of latent print development techniques
are used to develop prints from porous materials? -
.....ANSWER ...✔✔ DFO, Ninhydrin, Physical
Developer
The final purple coloured compound usually produced
with the treatment of Ninhydrin - .....ANSWER ...✔✔
Ruhemann's Purple
What latent print development technique is used to
process nonporous materials that are wet? - .....ANSWER
...✔✔ Small Particle Reagent
A dye which stains protein present in blood to give a
blue-black product - .....ANSWER ...✔✔ Amido Black
The following types of fingerprints will fluoresce under
appropriate illumination - .....ANSWER ...✔✔ 1.
Natural latent fingerprints
,2|Page
2. Some types of contamination arising from the
environment and subsequently deposited in fingerprints
May be one of the first processes used in a sequence of
a fingerprint examination - .....ANSWER ...✔✔
Fluorescence examination
Gentian violet is a dye which stains fatty constituents of
sebaceous sweat producing an intense purple image. It
is very effective for the development of latent
fingerprints on... - .....ANSWER ...✔✔ Adhesive
surface of adhesive tapes
Alternative process names for Gentian Violet -
.....ANSWER ...✔✔ 1. Crystal Violet
2. Methyl Violet
Alternative process name for Amido Black - .....ANSWER
...✔✔ Naphthalene Black
Iodine vapour is physically absorbed by latent
fingerprint deposits and often fades unless fixed. What
color image is formed using iodine vapour? -
.....ANSWER ...✔✔ Brown
,3|Page
Gentian Violet can interfere with the forensic
examination for: - .....ANSWER ...✔✔ 1. Handwriting
2. Body fluids
3. Ink
Ninhydrin is a general purpose fingerprint reagent for
paper and some other porous surfaces. What
component of a fingerprint deposit does it react with? -
.....ANSWER ...✔✔ Amino Acids
How long does it generally take for Ninhydrin treated
prints to naturally, fully develop - .....ANSWER ...✔✔
Several weeks
The development of Ninhydrin treated prints may be
accelerated with the use of? - .....ANSWER ...✔✔
Heating and Humidification
Ninhydrin which uses a Freon solvent virtually eliminates
the following problem when processing porous materials
for latent prints? - .....ANSWER ...✔✔ Ink running
, 4|Page
Ninhydrin may be applied using what methods? -
.....ANSWER ...✔✔ 1. Dipping
2. Brushing
3. Spraying
Physical Developer (PD) is what kind of aqueous
reagent? - .....ANSWER ...✔✔ Silver-based
Physical Developer reacts with components of sebaceous
sweat to form what colored deposit? - .....ANSWER
...✔✔ Grey-silver
Physical Developer is a very effective reagent for
developing latent fingerprints on paper which has been:
- .....ANSWER ...✔✔ Wetted
These flake powders have been shown to be more
sensitive than most other types of powders - .....ANSWER
...✔✔ Aluminum
Which latent print development technique was replaced
by the Ninhydrin/Physical Developer combination for
treating porous materials for latent prints? - .....ANSWER
...✔✔ Silver Nitrate
