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Interactions Between Silver Plated Surfaces with Protective Lacquers

I am looking for a protective transparent lacquer, which preserves Silver plated (silver nitrate route) small objects (plastics or metallic) from become pale yellow and finally yellow-brown. I noticed that silver in air is stable (it's brightness and colour) while all the lacquer we utilized to protect the plating where unsuccessful.

Any suggestion is appreciated.

Carlo Cantalini
Dept. of Chemistry and Materials - L'Aquila - Italy
2001

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