Fig. 4
From: The white of the 20th century: an explorative survey into Dutch modern art collections
PCA scoreplot of all artwork averaged for spectra taken from white areas and normalized to maximum. The scores in the plot are boxed by type of paint, colored using a red gradient by decade and labeled by artist. The origin lines are indicated in black. This figure can be interpreted as a reference roadmap of how different white pigments have been used throughout the 20th century. The time arrow represents the identified trend, despite several exceptions in the lead cluster