Deck 13: Chemical Processing Methods: Other Substrates and Matrices

Question 1

greasy or oily fingerprints are always visible.

Answer 1

False

Question 2

What are oils and what are they composed of?

Answer 2

a. Viscous, non-polar substances
b. Lipids or petroleum-based products

Question 3

amido black is a chemical reagent for processing greasy fingerprints on a nonporous surface.

Answer 3

False

Question 4

Which fluorescent chemical reagent is used to process latent prints composed of lipids?

Question 5

What is the most commonly used fingerprint reagent for developing latent prints on greasy nonporous or porous surfaces?

Question 6

What is the final technique in the processing sequence that may be used to develop oily fingerprints or fingerprints on greasy surfaces?

Question 7

Why do bloody fingerprints require extra PPE?

Question 8

What is the most common protein dye stain used to enhance bloody fingerprints?

Question 9

What processing step is required prior to processing a bloody fingerprint with amido black or acid yellow?

Question 10

In what circumstances would acid yellow 7 be used to process bloody fingerprints?

Question 11

Why are cartridge casings especially difficult metallic surfaces for developing latent fingerprints?

Question 12

Which surfaces on a weapon are not conducive to latent print development?

Question 13

What is gun blueing?

Question 14

usable, identifiable fingerprints from human skin are common.

Question 15

List five reasons why the skin of a live victim is not conducive to latent fingerprint recovery.

Question 16

What is the most successful technique for developing latent prints on human skin? Describe this technique.

Question 17

List three examples of adhesive substrates.

Question 18

What is crystal violet?

Question 19

How are dark colored tapes processed?

Question 20

How are tapes processed with fingerprint powder suspensions?

Question 21

Why is it important to use nonpolar versions of fingerprint reagents to process thermal paper?

Question 22

What is the suggested processing sequence for thermal papers?