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    • Violet and green lasers shining through bottles of tonic water.
    Rights: The University of Waikato Te Whare Wānanga o Waikato Published 21 June 2019 Size: 110 KB Referencing Hub media

    Violet and green lasers shining through a bottle of tonic water illustrating the fluorescence1 of quinine2. The green laser does not have enough energy to cause fluorescence in the quinine but the violet laser does.

    1. fluorescence: The giving out of light when atoms are excited by an external energy source, such as light (but not heat).
    2. quinine: A bitter compound from the cinchona tree with medicinal and culinary uses.

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    Light – colour and fluorescence

    Visible light is the small part within the electromagnetic spectrum that human eyes are sensitive to and can detect. Visible light waves consist of different wavelengths. The colour of visible ...

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      fluorescence

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      2. The giving out of light when atoms are excited by an external energy source, such as light (but not heat).

      quinine

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      3. A bitter compound from the cinchona tree with medicinal and culinary uses.

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