Development Powders

Question 1

What are the three types of fingerprint impressions?

Answer 1

Latent (not visible)
Visible
Molded (3D- squished into some substance. Ie : chocolate)

Question 2

What is a take away impression?

Answer 2

The ridges have removed part of the matrix on the surface (may be dust or other substance)

Question 3

What are the 3 types of powders?

Answer 3

Regular
Fluorescent
Magnetic (regular and fluorescent)

Question 4

List some factors to consider for development (what to think about before dusting for prints)

Answer 4

Presence of foreign material

Type of substrate (non porous)

Probable age (age cannot be determined by appearance)

Monetary or sentimental value

Portability.

Question 5

Name some factors to consider for longevity of impressions

Answer 5

Atmospheric conditions
Substrate
Composition of matrix
Amount of matrix
Contamination

Question 6

What is the purpose of powders (4 things) it’s why we dust. What’s the purpose ..to be able to …

Answer 6

1) to make the Latent impressions visible (we want to see them)
2) to create contrast with the background (to see them better)
3) to enable the impressions to be photographed (next step is photograph once we see them)
4) to enable the impressions to be lifted.

Question 7

When is it best to use fluorescent powders?

Answer 7

Anytime there is background interference (several different colors). Pop can or magazine or…
Cut crystal
Photographs/glossy magazine covers

Must be applied under UV light source

Question 8

Sciluminate powder can only be viewed with …..,,,,UV light, regular UV light won’t work

Answer 8

Short Wave

Question 9

Within how many hours of an impression being left can magnetic or Magna powder be used?

Answer 9

Within 24 hrs

Question 10

Name 4 various types of powder applicators

Answer 10

Fiberglass or carbon Filament brush
Magnetic wand
Squirrel or camel hair brush
Feather duster

Question 11

Fiberglass or carbon Filament brush is the most …….used brush

Answer 11

Commonly

One brush per powder

Question 12

What type of powders does the feather duster apply?

Answer 12

Fluorescent powders under alternative light source

Question 13

Name the application techniques for each brush
Fiberglass brush:
Feather duster:
Camel/squirrel:

Answer 13

Twirling
Back and forth
Cautious motion along ridge flow

Question 14

What section of the criminal
Code authorizes the dusting/collection of fingerprints ?

Answer 14

Section 25(1)(b) criminal code

Everyone who is required or authorized by law to do anything in the administration or enforcement of the law as a peace officer or public officer, is if he/she acts on reasonable grounds, justified in doing what he or she is required or authorized to do and in using as much force as necessary for that purpose

Question 15

List 4 types of lifting methods (tools)

Answer 15

Hinged lifters
Tape
Polyethylene tape(flexible)
Gelatin/ dental stone

Question 16

Name a few reasons why you would re powder a print?

Answer 16

-Substrate contamination removed
-Matrix smearing may be cleaned up
-excess powder removed
- you can get a more clear print

• you will add new markings on the 2nd powdered print.. you can re name as R1a or just write (lift #2). Add new markings if previous ones lifted, rephotograph and lift again

Question 17

What is appropriate PPE?

Answer 17

Safety Glasses
Half dust mask with p100 filters
Gloves
Lab coat
Safety data sheet

Question 18

If you draw an arrow outside of the circle what does it indicate?

Answer 18

Used for up/down direction. Ex ( if print on beer bottle would indicate where top of bottle is) arrows not used for plates etc.

Question 19

What are visible prints?

Answer 19

Impression detail that is left in blood or other material that makes the print visible

Question 20

Where to not use silver/lightening grey powder

Answer 20

Do not use on anything remotely Porous
Varnished or Coated surfaces, oily surfaces, wood, cash drawers, floors

Best used on dark surfaces, clear glass, silverware chrome : nickel

Question 21

Scilluminate is newer powder. Can be used for pourous and non porous surfaces

Answer 21

Same as question

Question 22

Magnetic powder can be used on porous surfaces?

Answer 22

Yes