Fixation of dye-type red and blue ink handwriting on aged paper

In this article, red and blue ink handwriting on aged paper was fixed by fixative to prevent handwriting from fading or diffusion during aqueous deacidification. Firstly, four fixatives were selected: polydimethyl ammonium chloride (PDDA), the quaternary ammonium salt of chitosan (HACC), cationic guar gum (CGG), and benzyl triethyl ammonium chloride (TEBAC) alcohol solution, according to their fixation effects on filter paper dyes, and derive the optimal composition ratio of the above four fixatives. Experimentally derived that PDDA has an excellent fixation effect on red ink handwriting, and HACC has an excellent fixation effect on blue ink handwriting. In addition, HACC also has a positive impact on the conservation of handwriting in real archives. The mechanical properties of aged paper were improved, and the paper fibers had no obvious change after the fixation and deacidification processes.

A novel glue remover for pressure sensitive tapes on aged paper

Pressure-sensitive adhesives consisting of polymer (t-butyl acrylate, PtBA) was widely used to repair aging paper. Over time, whiteness, mechanical properties and durability of paper degrade with the aging of adhesive. In this study, novel paper-friendly glue-remover (GR), consisting of organic solvents, was designed for removal of PtBA from aging paper. Dichloromethane and hexane were screened to prepare GR according the swelling degree of aged adhesive. For detail, the component of GR was adjusted to optimize removal effect and minimize the damage of GR on aged paper. Treated with GR consisting of 40% (v/v) dichloromethane/ normal hexane, the removal rate of PtBA was high to 56%. Results of mechanical and chromatism test indicates the GR will not damage the mechanical strength or handwriting on the paper. Moreover, the pH of paper increased from 3.55 to 5.75 after removal of glue, which suggested that GR help remove acid from aging paper.