Difference between revisions of "Brown chalk"
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== Description == | == Description == | ||
| − | An archaic common name for [http://cameo.mfa.org/materials/fullrecord.asp?name=umber umber], a dark brown earth pigment contains [http://cameo.mfa.org/materials/fullrecord.asp?name=silica silica], [http://cameo.mfa.org/materials/fullrecord.asp?name=clay clay], and a mixture [http://cameo.mfa.org/materials/fullrecord.asp?name=ferric | + | An archaic common name for [http://cameo.mfa.org/materials/fullrecord.asp?name=umber umber], a dark brown earth pigment contains [http://cameo.mfa.org/materials/fullrecord.asp?name=silica silica], [http://cameo.mfa.org/materials/fullrecord.asp?name=clay clay], and a mixture [http://cameo.mfa.org/materials/fullrecord.asp?name=ferric%20hydroxide iron hydroxide] and [http://cameo.mfa.org/materials/fullrecord.asp?name=manganese%20dioxide manganese dioxide]. The name brown chalk was used prior to the 1800s when chemical compound names were standardized (Schur 1985). |
== Additional Information == | == Additional Information == | ||
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== Authority == | == Authority == | ||
| − | * | + | * 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 |
[[Category:Materials database]] | [[Category:Materials database]] | ||
Revision as of 07:24, 24 July 2013
Description
An archaic common name for umber, a dark brown earth pigment contains silica, clay, and a mixture iron hydroxide and 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, 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