South Tower Portal, St. Stephen’s Cathedral, Vienna
Entrance hall into the south tower, Madonna, 14th centuryLaserreinigung, Konservierung, Restaurierung
Client: Dombausekretariat St. Stephan
Project period: 2006
Location: St. Stephen’s Cathedral, Vienna
Technologies
Laser Cleaning
- Limestone
- 40 µm light blue: white lead with some Azurite, oil painting
- 30 µm red: Minium, oil
- white: white lead, strongly crackled, 1 blue Smalt grain on the surface, possibly only smudged from the overlying layer, strong oil browning on outside
- 200 µm blue: white lead, in contrast to sample with smalt, these from discoloured section, oil colour
- Sand and Calcium Carbonate (Limestone)
- green paint residues in the depressions: white lead, barite, chalk, ochre and green earth and some ultramarine
During the laser-cleaning-process, original polychrome remains were found. When localised, this remains have been uncovered in a mechanical way.
