From: A diagnostic tool for assessing the conservation condition of cellulose nitrate and acetate in heritage collections: quantifying the degree of substitution by infrared spectroscopy
Distance (cm)
0
0.9
1.8
2.7
3.5
5
5.5
5.8
6.8
8.5
DS by μFTIR
1.39
1.01
1.02
0.87
0.83
0.88
0.85
0.84
DS by ATR
1.36
0.79
0.76
0.82
0.80
0.78