Stability of Alum-Containing Paper under Alkaline Conditions

Area of Science:

• Paper chemistry
• Material science
• Conservation science

Background:

• Alum-rosin sizing was widely used, creating paper prone to degradation.
• Alkaline deacidification aims to neutralize acidity and enhance paper stability.
• Understanding degradation pathways is crucial for effective conservation.

Purpose of the Study:

• To evaluate degradation and stabilization methods for alum-containing paper.
• To assess the impact of alkaline deacidification on paper permanence.
• To compare the efficacy of different mass-deacidification processes.

Main Methods:

• Review of literature on paper degradation (hydrolysis, oxidation).
• Analysis of alum and rosin distribution in paper.
• Measurement of alkaline reserves after deacidification.
• Evaluation of mechanical properties for lifetime prolongation.

Main Results:

• Homogeneity of alum and rosin distribution impacts degradation.
• Alkaline hydrolysis and oxidation are key degradation factors, influenced by transition metals.
• Deacidification processes achieve varying levels of alkaline reserve.
• Efficacy of stabilization was assessed based on mechanical permanence.

Conclusions:

• Mass-deacidification procedures can improve paper permanence.
• Further research is needed to address open issues in paper degradation and stabilization.
• Optimizing deacidification is key for long-term preservation of historical documents.