| Zdroj: |
Strætkvern, K & Hjelm-Petersen, A 2021, ' Standing on the shoulders of our predecessors-a base and a viewpoint. Fifty years of working with conservation of waterlogged archaeological shipwrecks in Denmark. ', TINA MARITIME ARCHAEOLOGY PERIODICAL, no. 13, pp. 46-68 . < http://www.tinaturk.org/dergi/TINA_DERGI_SAYI_13/tina-13.pdf > |
| Popis: |
Although nearly 50 years apart, the Roskilde shipswould follow nearly the same steps during their conservation as the Skuldelev ships. These steps include:assessment of the state of preservation of the wood,selected impregnation and drying methods, recommended exhibition climate, mounting for exhibition,maintenance and evaluation of long term stability. Thedifferent methods used for conservation reflect the extensive technical and economic resources required forthe conservation of shipwrecks. When resources arelimited, large archaeological finds often lead to development of new, less resource demanding methodswhen scientific and technical progresses made over aperiod of time evolve into new and better conservationmethods.The Skuldelev ships were excavated between 1957and 1962 and conserved in the period from 1962 to1975. When the conservation of the wrecks started,the most used methods were still alum and creosote/petroleum treatments. As these methods were quiteinadequate, the Skuldelev ships were the first woodenarchaeological finds to be conserved with Polyethylene glycol (PEG) in Denmark and thereby opening awhole new era in conservation at the National Museum. New conservation methods, such as 100% PEGimpregnation and freeze-drying from tertiary butanol,were introduced.Several years later a new large archaeological find, theRoskilde ships, was discovered during excavation ofa new museum harbour at the Viking Ship Museumin Roskilde. The excavation took place from 1996to 1997 and when the conservation started in 1998,PEG was still the most frequently used impregnationagent for waterlogged wood. However, its application has changed over the years due to the progress inthe conservation skills and technical developments.For example, wood has been impregnated with 40%aqueous PEG solutions and freeze-dried in moulds toobtain the correct shape in order to minimize handlingand destruction of the surface of the wood. |
