Fig. 7

Laser cleaning tests at 1064 nm (top) and 532 nm (bottom) of yellow cockatoo feathers artificially soiled with dust. Optical microscope images (a, b, c, d, e, f—bars = 500 µm) and their corresponding SEM images (a’, b’, c’, d’, e’, f’). © The Trustees of the British Museum. Shared under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) licence.