Fig. 11

a Optical microscope image showing the slight discolouration of a red parrot feather after Er:YAG laser irradiation; b SEM image of the discoloured area on the feather showing no apparent damage of the barbules. © The Trustees of the British Museum. Shared under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) licence.