Mid and Near-Infrared Reflection Spectral Database of Natural Organic Materials in the Cultural Heritage Field

Figure 4

FTIR total reflection mode spectra (before the application of the KKT correction) of the studied lipid materials (black line: carnauba wax, gray line: beeswax, light gray line: shellac wax) in the regions of (a) CH stretching, (b) C=O stretching, (c) CH₂ scissoring, and (d) CH₂ rocking.

(a)

(b)

(c)

(d)