Attention: Safety Recall of Vernier Go Direct Charge Station. Click to learn more.



The Ink is Still Wet

Experiment #5



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 sensors and equipment. Additional equipment may be required.

Option 2


Ready to Experiment?

Ask an Expert

Get answers to your questions about how to teach this experiment with our support team.