Fig. 3From: Gellan residues on paper: quantification and implication for paper conservationATR-FTIR spectra (the relevant section is shown) of filter paper (a), modern rag paper (b), and historical rag paper (c) after poulticing with 3% gellan gel compared to a control; the baseline is corrected and normalized to 1030 cm−1. The spectra are stacked to make the regions of interest more visibleBack to article page