Cellulose is a polysaccharide which comprise 30-50% of wood. When it is heated over 300 degrees Celsius, it generates anhydrous saccharide by sudden weight decrease. On the other hand, when it is heated under 300 degrees Celsius, it is known to show gentle changes such as weight decrease, drop down of the polymerism ratio, and the brown change of color. Up to the present, the scorching at the high temperature could not have avoided.
According to this invention, Cellulose had protected from changing its color brown by reacted with compound A or compound B at about 240 degree Celsius, under Nitrogen condition.
After the reaction, these were 5 times washed by water. As results, washed Celluloses showed lower coloring tendency (remained white). Furthermore, when reacted with compound B, it showed the tendency only after heated.
This reaction is irreversible, and not dissolved in the existence of water.