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A RCHAEOLOGICAL bones are exposed to various deterioration factors, so polymers are used to improve their properties and give more durability. Traditional pastes were applied and evaluated before. This study aims to evaluate some modified pastes in order to improve the properties of traditional pastes. Montmorillonite MMT was modified with amino acid and characlterized in terms of Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Diffraction XRD and scanning electron microscope SEM. Nanocomposites of modified MMT with paraloid as acrylic polymer were evaluated using XRD to be used for gap filling and completion of archeological bones to give more resistance against surrounding environmental conditions. Accelerated ageing were used for evaluation of modified pastes and estimated through change of color by UV spectrophotometer, FTIR, mechanical properties (tensile, elongation and compressive strength) and surface morphology by SEM. The results confirmed that the modified pastes with modified mMMT nanocomposite showed good resistance against thermal ageing, and give high stability in terms of color change value, surface morphology and mechanical properties. As pastes with the mMMT gave negligible color difference as 0.98. In addition, the contact angles measurements reduced with smaller ratios as 12% and 7.5% than their corresponding pastes with no mMMT 22% and 11%, respectively. Moreover, pastes with mMMT showed higher density, lower porosity and lower water absorption and exhibit more resistance against thermal ageing.