Difference between revisions of "Brown chalk"
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== Description == | == Description == | ||
An archaic common name for [[umber]], a dark brown earth pigment contains [[silica]], [[clay]], and a mixture [[Ferric hydroxide|iron hydroxide]] and [[manganese dioxide]]. The name brown chalk was used prior to the 1800s when chemical compound names were standardized (Schur 1985). | An archaic common name for [[umber]], a dark brown earth pigment contains [[silica]], [[clay]], and a mixture [[Ferric hydroxide|iron hydroxide]] and [[manganese dioxide]]. The name brown chalk was used prior to the 1800s when chemical compound names were standardized (Schur 1985). | ||
| + | [[File:48.496-SC25960.jpg|thumb|Traces of brown chalk<br>MFA# 48.496]] | ||
| − | == | + | ==Resources and Citations== |
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* 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 | * 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 | ||
Latest revision as of 12:25, 10 May 2022
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).
Resources and Citations
- 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