Hydroxypropyl cellulose and Polyvinyl alcohol on paper as fixatives for pigments and dyes

The aim of this experiment was to find (semi-)synthetic adhesives for the restoration of graphic works of art, thus permitting the fixation of pigments without damaging the paper or changing the quality of the usual effect of all the colours. we decided to investigate the possibility of employing of a hydroxypropyl cellulose (Klucel G) and a polyvinyl alcohol of low molecular weight (Unitika Poval UP-050), the former in an alcohol solution and the latter in a water-alcohol solution. All experimental data point to the fact that neither polymer is damaging to the cellulose and furthermore that they exert protection against chemical deterioration. Optical measurements show that Klucel G and PVAI do not alter the colours of the pigments to which they are applied. Other tests on the effectiveness of the fixing were carried out by immersion of the protected pigments in water and in a deacidification solution. During and after the baths all pigments were stable and still remain so.