| Artist | Günther Uecker |
| Object | nail painting |
| Technique | paint, nails, cotton on wood |
| Dimension | 80 × 80 cm |
| Title | untitled |
| Datierung | 1963 |
Before treatment: The surface is covered in a dense layer of nicotin and dust. A cleaning test was carried out in the lower right corner. The painting was cleaned nail by nail. It is important to preserve the natural patina underneath the dirt layer.
After treatment.
Cleaning test.
During treatment.
Full shot (lower right corner cleaned).