An extensive collection of information on the properties, preparation, and use in painting of the ancient natural pigment brown ochre.
Christ in the House of Martha and Mary (Vermeer) - Wikipedia
Heritage, Free Full-Text
History of Color
Color Space Exploration of Paintings Using a Novel Probabilistic Divergence
Brown ochre - ColourLex
Girl with a Red Hat - Wikipedia
Titian, Bacchus and Ariadne Bacchus, Mellow colors, Underpainting
Venetian Red 50 ml
Brown ochre - ColourLex