From: Developing a non-invasive tool to assess the impact of oxidation on the structural integrity of historic wool in Tudor tapestries
Chemical functional group
Chemical names
Wavenumber (cm−1)
–SO2–S–
Cystine dioxide (CD)
1121
–SO–S–
Cystine monoxide (CM)
1071
–\({\text{SO}}_{3}^{ - }\)
Cysteic acid (CA)
1040
–S–\({\text{SO}}_{3}^{ - }\)
S-sulfonate
1022