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The Swedish 17th century warship Vasa and the Danish Skuldelev Viking ships from the 11th century were impregnated with polyethylene glycol (PEG) in the 1960s. The molecular weight, amount and integrity of this PEG were investigated at a range of depths below the wood surface. Large amounts of PEG could be extracted from degraded parts of the ships but hardly any from sound parts. Mass spectrometry...
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