Definite amount of CMC was dissolved is 1% NaOH solution
with continuous mechanical stirring until a homogeneous viscous
mixture was obtained then epichlorohydrin was added drop wise.
Silver nitrate solution was then added in different concentration
(0.5–3%) till pale brown color is observed. The paste was dried in
an oven at 80 ◦C for 15 min, and then cured at 130 ◦C for 3 min.