Potential effects of nano-cellulose and nano-silica/polyvinyl alcohol nanocomposites in the strengthening of dyed paper manuscripts with madder: an experimental study oleh Mostafa Abdel-Hamied, Rushdya Rabee Ali Hassan, Mohamed Z. M. Salem, Toka Ashraf, Merihan Mohammed, Nariman Mahmoud, Yasmin Saad El-din, Sameh H. Ismail