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Figure 3
(a) Absorbance spectra of paraffin on ultralene at Rad0* and Rad5*. Second derivative of the FTIR spectra in the 3650–2800 cm−1 region of the (b), (d), (f) first and (c), (e), (g) second session of exposure. Each colour represents a radiation level. Different air exposure times (1 h, 1 day, 1 week) are represented by the corresponding radiation colours (violet Rad0–Rad0*; blue Rad1–Rad1*; green Rad2–Rad2*; yellow Rad3–Rad3*; orange Rad4–Rad4*; red Rad5–Rad5*).

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