Fig. 5From: Evaluation of polyvinyl alcohol–borax/agarose (PVA–B/AG) blend hydrogels for removal of deteriorated consolidants from ancient Egyptian wall paintingsr-FTIR spectra of original painted stone, consolidated surface, surfaces treated with the six cleaning systems, red ochre powder, PVA–B/AG blend hydrogel, and SDS. All the spectra are shifted along the y-axis for clarity and the region is ~ 4000 to 375 cm−1Back to article page