Activity
Write a secret message
In this activity, students use a UV light-emitting diode pen to write secret messages and investigate a range of objects to see if or how they fluoresce.
UV fluorescence
Information can be kept secret using invisible fluorescent ink that can only be seen under UV light.
Rights: The University of Waikato Te Whare Wānanga o Waikato
By the end of this activity, students should be able to:
explain why an invisible dye fluoresces when UVA shines on it
use UV light to investigate objects to see if and how they fluoresce.
Download the Word file (see link below) for:
introduction/background notes
what you need
what to do.
Published:29 July 2008