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The Colour Violet: Chemistry or Physics?

Catherine E Housecroft¹

¹Department of Chemistry, University of Basel, BPR 1096, Mattenstrasse 24a, CH-4058 Basel;,

|September 14, 2019

Summary

This summary is machine-generated.

Violet iridescence in purple emperor butterflies is due to structural color in their wing scales, not chemical pigments. This structural coloration provides a vibrant violet hue.

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Area of Science:

* Biology
* Physics
* Materials Science

Background:

* Many organisms exhibit coloration through chemical pigments.
* Structural coloration, arising from micro- or nanostructures, is an alternative mechanism for producing color in nature.
* The purple emperor butterfly ( *Apatura iris* ) is known for its striking violet iridescence.

Purpose of the Study:

* To investigate the physical basis of the violet iridescence in the purple emperor butterfly.
* To determine whether the color is produced by pigments or structural features of the wing scales.

Main Methods:

* Microscopic examination of purple emperor butterfly wing scales.
* Analysis of light interaction with the scale nanostructure.

Main Results:

* The violet iridescence is not caused by melanin-based pigments.
* Ordered nanostructures within the wing scales were identified as the source of the color.
* These structures create constructive and destructive interference of light waves, resulting in iridescent violet hues.

Conclusions:

* The violet color of the purple emperor butterfly is a result of structural coloration.
* This finding highlights the diversity of light manipulation strategies in biological systems.
* Understanding such structures could inform the development of novel optical materials.