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Fig. 7 | Heritage Science

Fig. 7

From: Deep eutectic solvents: green solvents for the removal of degraded gelatin on cellulose nitrate cinematographic films

Fig. 7

Evaluation of cleaning performance using traditional solvents. I–IV: dark field 5 × surface OM photomicrographs of selected film areas before (left) and after (right) being treated with IPOH (II) and EtOH (III) using the same methodology as used with the DES. V–VII: 50 × UV OM cross-section photomicrographs of the film before cleaning (left) and after cleaning with IPOH (center) and EtOH (right). The treated side of the CN base is looking up. VIII:µATR-FTIR spectra: representative spectrum of gelatin residues before cleaning (A, dashed line), a representative spectrum of the film surface once cleaned with IPOH (B, black), and EtOH (C, dark gray); spectrum of an unplasticized CN standard reference (D, light gray). Diagnostic amide II band due to gelatin presence is highlighted with a magenta diamond

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