A naturally occurring dark brown earth named for a city in central Germany. Cassel earth, also known as Vandyke brown, contains organic humus or coal material mixed with iron oxides, alumina, and silica. When ignited, the pigment leaves a soft gray residue. The colorant is fugitive and fades on exposure to strong light.
Synonyms and Related Terms
Cassel earth; Natural Brown 8; CI 77727; pardo Van Dyke (Esp.); brun de Cassel (Fr.); marrone di Cassel (It.); Cassel's earth; Kassel earth; Cologne earth; Vandyke brown; Castle earth; Castile earth; Cullens earth; Colens earth; Collens earth
Physical and Chemical Properties
- Slightly soluble in oil.
- Discolors in alkalis turning grayish.
Resources and Citations
- Georgiana Languri, Molecular studies of Asphalt, Mummy and Kassel earth pigments, MOLART report 2004, available through Archetype Publications, London.
- Helmut Schweppe, Schweppe color collection index and information book
- M. Doerner, The Materials of the Artist, Harcourt, Brace & Co., 1934
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 558
- Ralph Mayer, A Dictionary of Art Terms and Techniques, Harper and Row Publishers, New York, 1969 (also 1945 printing)
- Colour Index International online at www.colour-index.org