Discoloration

An unwanted alteration or shift in the original color of an object or material, typically resulting from aging, light exposure, pollutants, chemical reactions, or previous treatments. Discoloration may appear as darkening, yellowing, fading, or localized staining, and often affects both the aesthetic appearance and the interpretation of an artwork. In some cases, discoloration is irreversible, although some forms—such as surface staining or certain oxidation products—can be reduced through carefully controlled conservation treatments. Understanding the cause and extent of discoloration is essential for determining appropriate intervention and long-term preventive measures. Learn more here.