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Table 1 Description of the eight samples

From: Quantification of formic acid and acetic acid emissions from heritage collections under indoor room conditions. Part I: laboratory and field measurements

Sample no.MaterialDescriptionYear
1PaperHandmade cotton rag paper1795–1809a
2PaperGroundwood-containing newspaper1914
3PaperGroundwood-containing paper1993
4PaperRecycled newspaper2017
5WoodFreeze-dried archaeological wood treated with 35–40% polyethylene glycol (PEG) 2000bViking Age (10th century)
6WoodHardwood from the handle of a shoemakers tool19th century
7WoodNew softwood packagingNew
8Cellulose acetatePhotographic negativeMid-20th century
  1. aSample no. 1 is dated based on watermark identification. bThe archaeological wood was treated with PEG from October 2013 to July 2016 and then freeze-dried from August 2016 to January 2017