1. Conservation Department, Faculty of Archaeology, Cairo University, Giza 12613, Egypt
2. Conservation Department, Grand Egyptian Museum, Cairo 11556, Egypt
3. Department of Physics, College of Science, Princess Nourah Bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia
4. Spectroscopy Department, Physics Research Institute, National Research Centre, 33 El Bohouth St. (Former El Tahrir St.), Dokki, Giza 12622, Egypt
5. Department of Physics, College of Science, Qassim University, Buraydah 51452, Saudi Arabia