64O LD historical papers always are suffering from yellowing and darkness specifically after natural aging, so this study aim to evaluated some traditional bleaching materials that used in treatments of documents and books like hydrogen peroxide and sodium borohydride. Physical and chemical changes in paper sheets (cotton linter paper and book) before and after aging were studied such as color change, pH measurements, tensile strength, burst strength, FT-IR spectrum and scanning electron microscopy (SEM). The result pointed out that H 2 O 2 & NaBH 4 lead to no significant improvement in mechanical properties of the historical paper. The effect of H 2 O 2 and NaBH 4 concentration, bleaching time and pH on paper sheet bleaching process were examined. Whiteness and yellowness results of the historical paper were evaluated for both bleaching methods. From this work it is clear that, it is not desirable to utilize bleaching agents for the treatment and conservation of ancient archaeological papers, but only in the essential cases they may be used in slight concentrations to treat yellowing, staining or stains.

Purpose This study aims to restore the lost mechanical properties of the prints with carrageenan, methyl hydroxyethyl cellulose (Tylose) and hydroxypropyl methylcellulose (Methocel). Design/methodology/approach The effect of these materials on the properties of the printed paper (modern and historical samples) has been evaluated under the influence of accelerated aging using pH measurement, the mechanical properties (tensile and elongation), FTIR and color changes. Findings The three consolidates reduced the acidity of treated samples significantly, but after ageing, it was observed that the pH of aged treated samples decreased slightly as compared to the untreated samples. The results of the mechanical properties showed the superiority of hydroxypropyl methylcellulose (Methocel) in improving the tensile and elongation forces of the samples compared to carrageenan and methyl hydroxyethyl cellulose even during the accelerated aging. Consolidation materials succeeded in reducing ΔE of the paper samples under accelerated aging, especially carrageenan. The IR spectra confirmed that no dramatic difference was observed in topically function vibrations of samples after treatment beside that the O-H stretching band intensity increased observably after treatment with the three consolidates, after ageing the treatment, and it protected the treated paper from oxidation processes as the infrared spectrum analysis showed a decrease in intensities of carbonyl and carboxyl groups as compared to aged untreated samples. Originality/value The research provides new biopolymers in strengthening the historical printed paper, where printed papers lack studies related to their conservation. This makes the current study a promising step for treating historical printed paper.

Evaluating the effects of consolidation materials on tracing paper.• The evaluation method used was by SEM, tensile strength, elongation and FTIR spectroscopy. • The hybrid mixture of hydroxypropyl cellulose and nanocellulose was one of the best materials to consolidate tracing paper. • The hybrid mixture gave the best results to treated tracing paper.

One of the most important challenges to libraries and museums in many countries is the problem of forged Arabic and Islamic manuscripts, especially with the increasing global interest in the last three decades of Islamic art, in general, and the Arabic manuscripts, in particular. Forged manuscripts can be completely new manuscripts. They may also include added or deleted partscalled enhanced manuscripts-to achieve a target or to meet the global market demand for such Islamic manuscripts. The present study addresses the authenticity of a Quran manuscript dating back to 1834 AD using Digital Authenticity (2.5D). The image was divided into sections. Each section was analyzed by measuring the sensitivity of light absorption by (peaks). Then, the analyzed waves were divided into low and high frequencies that were compared. If there is a forged part, it appears in the frequencies in a way that highlights its difference from the other the frequencies on all bands. While the first band shows the form of nanometric details, such as the rough surface and the non-stable image, the second highlights the difference in the distribution of ink on the

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