1. LIFTING LATENT PRINTS
MRS. MACWILIAMS
CSI FORENSIC SCIENCE

2. LATENT FINGERPRINT PRELAB
SILVER NITRATE (AgNO3)- reacts with salt from sweat; used in photography
Sunlight/UV light needed to develop
A “fixative” is used to set the print
Silver Nitrate Video

3. LATENT FINGERPRINT PRELAB
CYANOACRYLATE (superglue)- reacts with amino acids

4. LATENT FINGERPRINT PRELAB
IODINE- reacts with fatty acids
Iodine fumes stain print
Starch solution is used to set

5. LATENT FINGERPRINT PRELAB
NINHYDRIN- reacts with amino acids; turns pink/purple
Can be further developed with zinc chloride solution (we don’t have)
Ninhydrin Video

6. LATENT FINGERPRINT PRELAB
DUSTING- most common latent fingerprint technique; adheres to print residues; various colors of powders (we will use black)
Dusting Technique

7. LATENT FINGERPRINT PRELAB
Order of CHEMICAL fingerprint developing
Iodine ninhydrin/super glue silver nitrate
(chemicals wash away residues)
Regrowing a Finger (Including the print!)