Fig. 2From: A diagnostic tool for assessing the conservation condition of cellulose nitrate and acetate in heritage collections: quantifying the degree of substitution by infrared spectroscopyInfrared spectra of a celluloid reference and camphor left. DS linear calibration curves for µFTIR and ATR-FTIR and respective equations and coefficients of determination (R2), right. For more details, see the textBack to article page