Mineral
Ochre
Picture to come.
A natural earth coloured by iron oxides, ranging from yellow to red and brown, mixed with clay and sand. It was dug from clay deposits, washed and ground into pigment; heating yellow ochre drives off water and turns it red. Cheap and widely available, red and yellow ochres were among the commonest pigments of the Middle Ages, used in wall painting and for marking and colouring.
Caveats (confidence: high)
Use in English medieval wall painting is well known, but the source consulted discusses ochre mainly in general and Renaissance terms.
Sources: en.wikipedia.org
Made by
- Dig clay