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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.

Material

Description

Year

1

Paper

Handmade cotton rag paper

1795–1809a

2

Paper

Groundwood-containing newspaper

1914

3

Paper

Groundwood-containing paper

1993

4

Paper

Recycled newspaper

2017

5

Wood

Freeze-dried archaeological wood treated with 35–40% polyethylene glycol (PEG) 2000b

Viking Age (10th century)

6

Wood

Hardwood from the handle of a shoemakers tool

19th century

7

Wood

New softwood packaging

New

8

Cellulose acetate

Photographic negative

Mid-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