Comparative study of the tarnishing resistance of several coloured base gold al...

• Author(s): Carvalho, O. ; Soares, Delfim ; Fonseca, A. Maurício C. ; Silva, F. S.
• Date: 2011
• Persistent ID: http://hdl.handle.net/1822/14819
• Origin: RepositóriUM - Universidade do Minho
• Subject(s): Coloured gold alloys; Tarnishing; Corrosion; Artificial sweat
• Document Type: Article
• Language: English

Description

The stability of coloured gold alloys may be dependent on the environment that involves them. This paper is concerned with the effect of an artificial sweat solution in the stability of several gold base alloys with different colours. The changes in the samples physical properties, colour, brightness, and reflectance were measured for several periods of immersion. Two types of alloys (purple and blue coloured alloys) showed to be sensitive to the artificial sweat solution. The other tested alloys have a high resistance to tarnishing comparable with the results obtained for pure gold.