Meant to follow my "Dusting for Prints" lab (but not necessary), in my irregular surfaces lab students will be working on their own to develop prints they make on the sticky side of duct tape, on paper using iodine, on cardboard using ninhydrin, on woodchips using silver nitrate, and on a plastic page protector or overhead transparency using superglue (cyanoacrylate).
I wrote this lab the first year I started my forensics class and had no budget, so most materials, besides perhaps ninhydrin and the candle warmer, are easily accessible and should be on most high school campuses. While it takes a fair amount of setup, the students have a GREAT time and it's well worth it!
Includes materials list, safety considerations, tips on getting and making materials, and an answer key for the questions at the end of the lab. Requires 2 90-minute periods.
Materials needed but not included:
Fingerprint powder or fine ground charcoal
Fingerprint dusting brush or makeup blush brush
Large Test Tube
Hot water bath
Wood chips (1 per student, available from your school's wood shop)
Silver Nitrate in a Spray Bottle
UV Light source (or window, or students may go outside.
Large Cardboard box
Ninhydrin solution in Spray Bottle
Acetone in Spray Bottle
Paper towel or cloth
Access to outdoors
o Cardboard box with lid (like paper comes in)
o Page protector or overhead transparency
o Candle warmer
Overhead transparencies or sheet protector (1 per student)
50mL beaker of water
6” aluminum foil
Copies of lab (1 per student)