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  • 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.

    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, Updated 1 March 2013 Referencing Hub articles
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