Understanding Fingerprint Development with Iodine

Dr. Scott Chadwick from UTS Science explains the process of developing fingerprints using iodine paper. The video covers the use of iodine crystals to expose fingerprints on paper, the importance of sealing to prevent toxic vapor escape, and the application of a fixing solution to preserve the developed prints. The process results in a color change from brown to dark blue, allowing for photographic documentation and comparison with database records.

What is the initial state of iodine used in the fingerprint development process?

• Plasma

• Liquid

• Gas

• Solid

What happens to the iodine when it is exposed to the paper?

• It melts and spreads

• It vaporizes and reveals fingerprints

• It changes color

• It dissolves in water

How long does it typically take for the fingerprints to develop in the iodine vapor?

• 1-2 minutes

• 5-10 minutes

• 30-40 minutes

• 15-20 minutes

Why is it important to seal the beaker during the experiment?

• To prevent the paper from drying

• To increase the temperature

• To keep the iodine vapor contained

• To enhance the color of the fingerprints

What is the main risk associated with handling iodine in this experiment?

• It is explosive

• It is corrosive

• It is toxic

• It is highly flammable

What is the purpose of using a fixing solution in the fingerprint development process?

• To make the fingerprints permanent

• To remove excess iodine

• To clean the fingerprints

• To change the color of the fingerprints

What color do the fingerprints turn after applying the fixing solution?

• Dark blue

• Green

• Yellow

• Red

What is the final step in preparing the fingerprints for comparison?

• Drying the paper

• Photographing the fingerprints

• Washing the paper

• Heating the paper

What is the role of the developing tray in the fingerprint process?

• To store the paper

• To dry the fingerprints

• To contain the fixing solution

• To hold the iodine crystals

What is the visual indication that the fingerprints have been successfully developed?

• They form a dark blue coloration

• They turn red

• They emit a glow

• They become transparent