Wu Dong smiled, and his fingertips gently brushed the yellowed paper of the Song Dynasty. The touch was rough but with the warmth of time: "The preciousness of ancient paper lies in its uniqueness. Each piece of paper carries the traces of craftsmanship and time at that time. If it is replaced with new materials, it will lose its value." Even so, he felt helpless in his heart. Having been engaged in the restoration of ancient books for many years, he has seen too many precious documents that cannot be saved due to decay of paper. The feeling of powerlessness makes him feel heartbroken every time.
