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20.”Ruddle”, pure haematite, Florence Mine, Cumbria.
21. Burnt Siena, roasted in kiln to 620°C, Castelmuzio, Siena Province, Italy.
22. Warton Red Ochre, from open pits, Warton, Lancashire.
23. Red-Violet Iron Oxide, from open pit, Plumpton Bright, Ulverston, Cumbria.
24. Mine Ochre, hand dug, Clearwell Caves, Forest of Dean, Gloucestershire.
25. Mine Ochre, hand dug, Clearwell Caves, Forest of Dean, Gloucestershire.
26. Brown Earth, cotton fields, Lewa Downs, Mount Kenya, Kenya.
27. Brown Earth, cotton fields, Lewa Downs, Mount Kenya, Kenya.
28. Brown Earth, cotton fields, Lewa Downs, Mount Kenya, Kenya.
29. Brown Earth, cotton fields, Lewa Downs, Mount Kenya, Kenya.
30. Brown Earth, cotton fields, Lewa Downs, Mount Kenya, Kenya.
31. Volkonskoite Green, light, Perm Basin, Okhansk, Russia.
32. Volkonskoite Green, dark, Perm Basin, Okhansk, Russia.
33. White Chalk, dug from open chalk pit, Test Valley, Hampshire.
34. Graphite, raw, found close to original mine entrance, Borrowdale, Cumbria.
35. Yellow Clay Ochre, from disused iron pits, The Bloringe, Usk Valley, Wales.
36. Oxford Ochre, Shotover Hill, Oxford.
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