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Fig. 3 | Heritage Science

Fig. 3

From: Rapid identification of cellulose nitrate and cellulose acetate film in historic photograph collections

Fig. 3

TR infrared spectrum of cellulose acetate (a) original data (b) resulting spectrum after application of the Kramers-Kronig transformation (KKT), which is used to calculate the absorbance spectrum. Red solid circles mark the Reststrahlen band which results from a change in the refractive index with strongly absorbing bands, red dashed circle marks the interference fringes

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