Egypt was studied. • Some aspects of deterioration were noticed such as brittleness, cracks, Wrapping, tears and etc. • Analytical techniques (SEM, ATR-FTIR, amino acids, pH. etc. were used to study the characterizations of the historical leather cover of manuscript. • The results proved that the historical leather cover suffers from deterioration caused by different factors.

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Evaluating the stability of some acrylic-based polymers (Paraloid B72, Lascaux® Hydroground 750, and Pébéo Satin Matt Picture Varnish).• Thermal and UV accelerated ageing were performed on laboratory model samples according to literature data . • The evaluation process was performed using optical microscopy, colorimetry, scanning electron microscopy, and FTIR spectroscopy . • Among the tested products, the Matt picture varnish (based on acrylic resin and polyethylene wax) showed the best durability against ageing procedures.