Fig. 5

Characterization of optical transparency. a, Diffusion of light through the dry and lubricated surfaces for the 7 nm and 40 nm particle sizes. Inset shows a depiction of different components of light reflection and transmission. b, Transmission of light through the dry and lubricated surfaces for the 7 nm and 40 nm particle sizes. The transmittance values are in reference to an uncoated glass slide. c, Restoration of optical transparency of the surface after rehydration through a nebulized water spray (Photo credits of the Pitcher plant: Geoff McKay, https://flickr.com/photos/129472387@N07/49360096312, Copyright license CC-by-2.0).