Fig. 3From: ZnO, TiO2 and Fe3O4/Carbopol hybrid nanogels for the cleaner process of paper manuscripts from dust stains and soil remainsPreparation steps of stained paper; A The collected dust; B The prepared dust mixed with distilled water; C, D Application of a thin layer of the prepared dust over the what-man paper by brush; E The stained paper before drying; F The stained paper after dryingBack to article page