Heritage Science

Table 5 Pyrolytic composition of wooden samples expressed as a relative percentage of total pyrolysis products derived from H-holocellulose and L-Lignin. The H/L ratios are also shown

From: Comparative chemical investigations of alum treated archaeological wood from various museum collections

Reference fresh and archaeological untreated
Sample	Ref. pine	Ref. maple	Ref. birch	Arch pine	Head post N-124	Sled pull N-17
H	60.7	59.9	78.5	49.9	22.9	35.7
L	39.3	40.1	21.5	50.1	77.1	64.3
H/L	1.5	1.5	3.7	1.0	0.30	0.56

Dejbjerg, Danish
Sample	D-A1624	D-B1624	D-C1628	D-D1626-A core	D-D1626-B surf	D-E1622-A core	D-E1622-B surf	D-F1629
H	23.1	11.5	27.2	17.0	11.5	9.3	12.5	18.7
L	76.9	88.5	72.8	83.0	88.5	90.7	87.5	81.3
H/L	0.30	0.13	0.37	0.21	0.13	0.10	0.15	0.23

Oseberg, Norwegian
Sample	N-187D	N-187L	N-207-A core	N-207-B surf	N-250F	N-250K
H	2.5	2.0	8.9	16.9	43.3	41.0
L	97.5	98.0	91.1	83.1	56.7	59.0
H/L	0.03	0.02	0.10	0.20	0.76	0.70

Glimmingehus, Swedish
Sample	S-5T	S-125h retreated	S-125k	S-346 retreated	S-346d	S-346e	S-383	S-383c
H	87.8	53.2	85.5	80.2	46.5	40.2	36.4	23.4
L	12.2	46.8	14.5	19.8	53.5	59.8	63.6	76.6
H/L	7.2	1.2	5.9	4.2	0.9	0.7	0.6	0.3

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