Brown chalk
Revision as of 13:02, 27 April 2013 by (username removed)
Description
An archaic common name for umber, a dark brown earth pigment contains silica, clay, and a mixture hydroxide iron hydroxide and dioxide manganese dioxide. The name brown chalk was used prior to the 1800s when chemical compound names were standardized (Schur 1985).
Additional Information
S. Schur, "Conservation Terminology: A Review of Past & Current Nomenclature of Materials", Technology and Conservation, 1985.
Additional Images
Authority
- Susan E. Schur, Susan E. Schur, Conservation Terminology: A review of Past & Current Nomenclature of Materials, Technology and Conservation, Spring (p.34-39); Summer (p.35-38); Fall (p.25-36), 1985