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Planar and Three-Dimensional Printing of Conductive Inks
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From Ink to Mockup: An Integrated Study of Historical Gall Ink Formulations and Their Impact on Paper
Margarida Nunes1, Joana Costa Vieira2, Ana Paula Costa2
1Universidade de Évora, HERCULES Laboratory/IN2PAST, Évora, Portugal.
Chempluschem
|January 30, 2026
Summary
Iron gall inks (IGIs) pose conservation challenges. Unbalanced ink composition, particularly high iron(II) sulphate to gallnut ratios, accelerates paper degradation through cellulose oxidation, impacting historical documents.
Area of Science:
- Materials Science
- Chemistry
- Conservation Science
Background:
- Iron gall inks (IGIs) are historically significant writing materials.
- IGIs present considerable conservation challenges due to their inherent instability.
- Understanding IGI degradation is crucial for preserving historical documents.
Purpose of the Study:
- Investigate the physicochemical behavior of IGI formulations from Portuguese historical sources.
- Assess the impact of IGIs on paper degradation over time.
- Correlate ink composition with degradation severity.
Main Methods:
- Characterization of fresh and aged IGI precipitates and solutions.
- Analysis of IGI-treated Whatman paper using ATR-FT-IR, Raman, Mössbauer spectroscopy, and XRD.
- Evaluation of pH, cellulose degree of polymerization, and physical properties.
Main Results:
- Dried IGIs form Fe(III)-polyphenol complexes; aged inks show structural alterations.
- Paper degradation involves Fe(II) oxalate formation and cellulose oxidation.
- Unbalanced ink composition (high Fe(II) sulphate:gallnut ratio) exacerbates paper decay.
- Ink concentration and disordered cellulose structure correlate with degradation.
Conclusions:
- Cellulose oxidation is the primary IGI-induced paper degradation mechanism.
- Ink composition imbalance significantly impacts degradation severity.
- Ink concentration and resulting structural changes in cellulose are critical factors in paper decay.
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