Fig. 5: FTIR Spectra of WAW. | npj Heritage Science

Fig. 5: FTIR Spectra of WAW.

From: Physical and chemical degradation characteristics of waterlogged archaeological wood from the wenzhou no.1 shipwreck

Fig. 5

These spectra characterize structural changes in cellulose, hemicellulose, and lignin between sound and archaeological wood samples: a Chinese fir: The “control” curve represents the spectrum of sound (undegraded) Chinese fir, while other curves correspond to spectra of archaeological Chinese fir samples (labeled as samples 2, 4, 5, 6, 7, 10). b Chinese cypress: The “control” curve denotes the spectrum of sound Chinese cypress, and other curves correspond to spectra of archaeological Chinese cypress samples (labeled as samples 1, 3, 8, 9). Absorbance (arbitrary units, a.u.) is plotted against wavenumber (cm⁻¹), with key characteristic peaks marked to identify functional groups of cellulose, hemicellulose, and lignin.

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