1. TYPES OF FINGERPRINTS AND FINGERPRINT COLLECTION

2. Types of fingerprints Latent fingerprints
Visible fingerprints (patent fingerprints)
Plastic fingerprints (impressed fingerprints)

3. Latent Fingerprints (invisible prints)
Invisible prints that are left on a hard surface
Are formed when sweat and oil from the body is left behind on an object
Latent prints are invisible to the naked eye and must made visible, then preserved, analyzed, and compared.
The smoother and less porous a surface the greater the chances for lifting the prints.
These are among the most common and valuable types of physical evidence

4. Visible Fingerprints (Patent prints)
are visible prints that are left on a hard surface that leave a distinct ridge impression
occur when a foreign substance on the skin of a finger is transferred to the surface of another object.
Blood, paint, ink, etc.
Can occur on a variety of surfaces smooth or rough, porous and nonporous.
Wood, metal, clothe, glass, etc

5. Plastic Fingerprints
are visible prints that are left on a soft surface and most likely 3 dimensional
Soap or wax
freshly painted object or fresh caulk
or any substance that will soften when hand held and then retain the finger ridge impressions.
Are impressed onto an object and can easily be observed

6. How to collect patent fingerprints
Very simply – photography
The prints are photographed in high resolution with a forensic measurement scale for reference
If need be investigators can improve the quality of the photo through
Light adjustment
Using alternate angles
Chemicals and dyes

7. How to lift latent prints
Dusting with fingerprint or magnetic powder
Smooth or nonporous surface
Prints are then photographed and then lifted with clear tape. The tape is placed on a latent lift card.
Cyanoacrylate – superglue fuming of a surface before applying powders or dyes
Nonporous surfaces
Fumes adhere to the prints allowing them to be viewed
Superglue fuming also allows prints to be lifted more than once
Chemical Developers: ninhydrin
Used on porous surfaces, such as paper
The chemicals react with amino acids and inorganic salts, from bodily fluids, left behind with the print
Turns the print purple so it can be easily photographed

8. Demo Videos Dusting-basic fingerprint lifting Superfuming
Magnetic Powder
Iodine/Ninhydrine
Spray fingerprint powder
Pop and Fume Fume Chamber
Lifting prints on irregular surfaces with Mikrosil