Vernier Software and Technology
Vernier Software & Technology

The Ink is Still Wet


SPRINGFIELD, September 10: Science has proven indispensable in solving yet another kidnapping case. This time, a special kind of fingerprint—a chemical fingerprint—proved to be the crucial clue in recovering the victim, 22-year-old Shawn Morgan, unharmed.

It was only in the last month that Morgan sold his design for the TrueMind artificial intelligence system to the United States government for $100 million. As fate would have it, a day later, Morgan vanished. When investigators forcibly entered Mr. Morgan’s apartment, they found it empty except for a ransom note written on a piece of computer paper. The note was written in black ink, and the handwriting varied in style, so police handwriting experts were at a loss to come up with a profile.


  • Identify an unknown ink by its light absorbance characteristics.
  • Measure a solution's absorbance of different colors (wavelengths) of light.

Sensors and Equipment

This experiment features the following Vernier sensors and equipment.

Additional Requirements

You may also need an interface and software for data collection. What do I need for data collection?

Standards Correlations

See all standards correlations for Forensics with Vernier »

Forensics with Vernier

See other experiments from the lab book.

1Tracks of a Killer
2Bouncing Back
3Name That Tune
4Making Cents of Math: Linear Relationship between Weight and Quantity
5The Ink is Still Wet
6Speeding Up
7Drug Tests
8No Dumping
9Killer Cup of Coffee
10Dropped at the Scene
11Ashes to Ashes
12Hit and Run
13Life in the Fast Lane
14Chill Out: How Hot Objects Cool

Experiment 5 from Forensics with Vernier Lab Book

<em>Forensics with Vernier</em> book cover

Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.

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