A non-invasive study of the effect of three commercial cleaning products on shellac-coated mahogany

The Royal Palace of Norway has a large 19th century wooden furniture collection and most it is coated with shellac-based varnishes. Since these objects are part the royal collections, they still in daily use at different residences and, therefore, need to be frequently cleaned. In this work, effect three cleaning commercial products (Baolin, Centurio, Fulgentin) used collections on shellac-coated mahogany investigated for first time. A non-invasive methodology (portable ER-FTIR spectroscopy colorimetry) was applied assess whether chemical composition color fresh artificially aged wood mock-ups shellac were affected by above-mentioned products. This study shows that one them causes changes varnished wood, thus potentially affecting long-term conservation collection.