This paper focuses on finding an inert formulation for pigmented wax-resin infills to be used for oil paintings on copper. Two pigmented wax-resin formulations currently in use are characterised: one supplied by one of the authors (G-PWR) and the other, a commercial product, Gamblin Pigmented Wax-Resin sticks (G-PWR): While both have excellent properties, they contain natural beeswax which has been reported to result in corrosion where in contact with copper. Acid number measurements confirm that both are acidic. Although ageing testes are still needed, the characterization and properties of two new formulations, both based on Techniwax 9426 microcrystaline wax with either Regalrez 1094 or 1126, are promising. Both new wax-resin mixtures, with an acid number of 0, are likely to be inert in relation to the copper and are anticipated to be chemically stable due to their composition.
|Number of pages||17|
|Journal||Paintings on copper and other metal plates: production, degradation and conservation issues. Valencia: ComunicaCC|
|Publication status||Published - 2017|