Investigation of Damaged Paper by Ink Corrosion
The investigation of cotton fibers sheets treated with different historical writing inks: Pfalz ink from red wine (ink-1,
pH 3.51), Ink from the oak’s bark extracts (ink-2, pH 3.69); Iron-gall ink (ink-3, pH 1.66), Black ink with iron(II)
sulphate (ink-4, pH 1.52 ), Black ink with copper(II) sulphate (ink-5, pH 2.14), Logwood tree ink (ink-6, pH 5.73),
German recipe A (iron(II) sulphate) (ink-7, pH 1.94), German recipe B (iron(II) sulphate) (ink-8, pH 1.62) was
performed using FTIR spectroscopy. The paper and ink treated paper samples were artificially aged (accelerated thermal
and photo ageing) also analyzed and the results compared with the non-treated ones. The study focus was on the
spectrum range between 1500 cm–1 and 1900 cm–1, where the products of the paper ageing appear as various carbonyl
groups. After immersing paper to inks with metal ions, the increase of absorption at 1713 cm–1 – 1745 cm–1 was
observed. Also, the drastic decreasing of polymerization degree of ink treated samples was estimated.
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