1. Methods for Taking Fingerprints

2. https://learninglab.si.edu/resources/view/633923

3. Visible Prints
Visible prints are made when fingers touch a surface after touching a colored substance like blood, ink, grease, paint, ect.
Plastic Prints
Are made when ridge impressions are left in soft surfaces like putty, wax, soap, dust, ect.

4. Latent Prints On hard and non-absorbent surfaces On Porous surfaces
Ex. tile, mirrors, painted wood
Developed with powder
On Porous surfaces
Ex. Papers cardboard, and cloth
Devolved using chemicals

5. Latent print developing techniques
RUVIS
Reflected Ultraviolet Imaging System
Used to locate latent prints
Powder
Used once prints are located
Comes in several colors, magnetic and non magnetic
Adheres to perspiration and oils in print
Can be photographed or collected with tape

6. Latent print developing techniques
Super Glue fuming
Used on nonporous surfaces
Ex metals, electrical tape, leather and plastic
Fumes of super glue adhere to proteins in print and make a white visible print
Made of 99% cyanoacrylate ester, which is what makes the prints visible
Can be done in a fuming chamber or with a handheld wand
Iodine Fuming
Iodine crystals are heated and fumes
combine with print to make them
visible
Not permanent, will fade quickly

7. Latent print developing technique
Ninhydrin
Reacts with amino acids in prints to make a purple blue color
Physical Developer
Is a silver nitrate based reagent
Used when other techniques fail
Other chemicals used include those that cause the print to fluoresce under a laser or high intensity light source such as…
Quartz halogen, xenon arc, indium arc

8. Transporting prints Small Objects Large objects
Transport entire object
Large objects
Photograph first
Allows print to be compared to digital database
Then lift with tape and place on labeled cards

9. Classifying prints

10. Pattern Prevalence

11. One more identification technique Loop Count