Beauty is skin deep: the skin tones of Vermeer's Girl with a Pearl Earring. - van Loon, Annelies; Vandivere, Abbie; Delaney, John K.; Dooley, Kathryn A.; De Meyer, Steven; Vanmeert, Frederik; Gonzalez, Victor; Janssens, Koen; Leonhardt, Emilien; Haswell, Ralph; de Groot, Suzan; D'Imporzano, Paolo; et al. (Heritage Science, 2019)