Fig. 12From: ZnO, TiO2 and Fe3O4/Carbopol hybrid nanogels for the cleaner process of paper manuscripts from dust stains and soil remainsDigital microscope images of cleaned paper samples with ZnO NP/carbopol hybrid nanogel before and after aging; A Cleaned sample with LV nanogel; B Aged cleaned sample with LV nanogel; C Cleaned sample with HV nanogel; D Aged cleaned sample with HV nanogelBack to article page