The image shows some scales that cover the surface of the wing of the Erebia neoridas, as of other lepidoptera. The image was taken under an optical microscope.
<a href="//commons.wikimedia.org/wiki/User:Mtbusca" title="User:Mtbusca">Giovanna Canu, Maria Teresa Buscaglia</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>