Abstract
Currently gels or dispersions are widely used in the restoration of paintings, graphic arts, stuccoworks and stones, but their use in metal restoration is less widespread. In this study, several gels and dispersions were selected for use in metal treatments. These gels and dispersions have been tested as a support for the treatment solutions usually used for chemical treatments of metals. First, the compatibility of these physical and chemical gels or dispersions with selected treatment solutions was checked. Viscous physical gels (Xanthan gum), collagen-based physical gels (nerve glue), chemical gels (Nanorestore gels®) or dispersions (polyacrylic acid, cellulose-based compound) displayed good compatibility with acid, neutral or basic solutions. Physical peelable gels (Agar or gellan gum) displayed more limited compatibility but were more easily applied on metallic objects. Test treatments were carried out on archaeological objects: silver-plated copper alloy coins. The best post-treatment results in terms of efficiency and the overall aesthetic appearance of the object were obtained with physical peelable gels (Agar or gellan gum) containing a treatment solution (2–5%w of disodium EDTA), applied hot.
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