Difference between revisions of "Chalconatronite"

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== Description ==
 
== Description ==
  
A powdery, blue corrosion product composed of a hydrated sodium copper carbonate. Chalconatronite has been found on corroded [http://cameo.mfa.org/materials/fullrecord.asp?name=bronze bronzes] which have been treated with [http://cameo.mfa.org/materials/fullrecord.asp?name=sodium%20sesquicarbonate sodium sesquicarbonate] (Horie and Vint, 1982) and on [http://cameo.mfa.org/materials/fullrecord.asp?name=silver silver] objects that were cleaned or replated using a [http://cameo.mfa.org/materials/fullrecord.asp?name=sodium%20cyanide sodium cyanide] solution (Strahan, 1986).
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A powdery, blue corrosion product composed of a hydrated sodium copper carbonate. Chalconatronite has been found on corroded [[bronze|bronzes]] which have been treated with [[sodium sesquicarbonate]] (Horie and Vint, 1982) and on [[silver]] objects that were cleaned or replated using a [[sodium cyanide]] solution (Strahan, 1986).
  
 
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Revision as of 15:19, 2 August 2013

Chalconatronite

Description

A powdery, blue corrosion product composed of a hydrated sodium copper carbonate. Chalconatronite has been found on corroded bronzes which have been treated with sodium sesquicarbonate (Horie and Vint, 1982) and on silver objects that were cleaned or replated using a sodium cyanide solution (Strahan, 1986).

Composition Na2Cu(CO3)2-3H2O
Refractive Index 1.662

FTIR

MFA- Chalconatronite, with some impurities.jpg


Additional Information

° D.A.Scott, Copper and Bronze in Art:Corrosion, Colorants and Conservation, Getty Publications, Los Angeles, 2002.° D. Strahan "Treatment of a Silver Dragon for the Removal of Silver Cyanide and Chalconatronite" JAIC, 25: 73-81, 1986. ° C. Horie, J.Vint, "Chalconatronite: A By-Product of Conservation?" Studies in Conservation 27:185-186, 1982. ° R. Gettens, C. Frondel "Chalconatronite: An Alteration Product on Some Ancient Egyptian Bronzes" Studies in Conservation, 2:64-74, 1955.

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