Polished metallic surfaces exhibit a high degree of specularity, which makes them difficult to reproduce accurately.
L. MacDonald, J. Hindmarch, S. Robson, M. Terras 2014, 'Modelling the appearance of heritage metallic surfaces', The International Archives of the Photogrammetry, Remote Sensing and Spatial InformationScienceshttps://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XL-5/371/2014/isprsarchives-XL-5-371-2014.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)