Mineralogical changes arising from the use of aqueous sodium carbonate solutions for the treatment of archaeological copper objects

A. M. Pollard; R. G. Thomas; Peter Williams

doi:10.1179/sic.1990.35.3.148

Mineralogical changes arising from the use of aqueous sodium carbonate solutions for the treatment of archaeological copper objects

A. M. Pollard
, R. G. Thomas
, Peter Williams

Cardiff University

Research output: Contribution to journal › Article › peer-review

29 Citations (Scopus)

Abstract

Mineralogical changes which occur during the reaction of copper(II) chloride with carbonate in aqueous solution have been investigated, and compared with those involving copper(I) chloride, nantokite, CuCI, and copper artifacts coated with malachite, CU₂CO₃(OH)₂ The reactions observed and the products obtained are seen to have implications with respect to the use of aqueous sodium carbonate solutions to stabilize archaeological copper objects. The frequent observation of the mineralogically rare species chalconatronite, Na₂Cu(CO₃)₂·3H₂O, on the surface of treated objects is readily explained by known reaction chemistry. Its formation can be minimized by washing the object after treatment.

Original language	English
Pages (from-to)	148-152
Number of pages	5
Journal	Studies in Conservation
Volume	35
Issue number	3
DOIs	https://doi.org/10.1179/sic.1990.35.3.148
Publication status	Published - 1 Aug 1990
Externally published	Yes

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10.1179/sic.1990.35.3.148

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title = "Mineralogical changes arising from the use of aqueous sodium carbonate solutions for the treatment of archaeological copper objects",

abstract = "Mineralogical changes which occur during the reaction of copper(II) chloride with carbonate in aqueous solution have been investigated, and compared with those involving copper(I) chloride, nantokite, CuCI, and copper artifacts coated with malachite, CU2CO3(OH)2 The reactions observed and the products obtained are seen to have implications with respect to the use of aqueous sodium carbonate solutions to stabilize archaeological copper objects. The frequent observation of the mineralogically rare species chalconatronite, Na2Cu(CO3)2·3H2O, on the surface of treated objects is readily explained by known reaction chemistry. Its formation can be minimized by washing the object after treatment.",

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AU - Pollard, A. M.

AU - Thomas, R. G.

AU - Williams, Peter

PY - 1990/8/1

Y1 - 1990/8/1

N2 - Mineralogical changes which occur during the reaction of copper(II) chloride with carbonate in aqueous solution have been investigated, and compared with those involving copper(I) chloride, nantokite, CuCI, and copper artifacts coated with malachite, CU2CO3(OH)2 The reactions observed and the products obtained are seen to have implications with respect to the use of aqueous sodium carbonate solutions to stabilize archaeological copper objects. The frequent observation of the mineralogically rare species chalconatronite, Na2Cu(CO3)2·3H2O, on the surface of treated objects is readily explained by known reaction chemistry. Its formation can be minimized by washing the object after treatment.

AB - Mineralogical changes which occur during the reaction of copper(II) chloride with carbonate in aqueous solution have been investigated, and compared with those involving copper(I) chloride, nantokite, CuCI, and copper artifacts coated with malachite, CU2CO3(OH)2 The reactions observed and the products obtained are seen to have implications with respect to the use of aqueous sodium carbonate solutions to stabilize archaeological copper objects. The frequent observation of the mineralogically rare species chalconatronite, Na2Cu(CO3)2·3H2O, on the surface of treated objects is readily explained by known reaction chemistry. Its formation can be minimized by washing the object after treatment.

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Mineralogical changes arising from the use of aqueous sodium carbonate solutions for the treatment of archaeological copper objects

Abstract

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