Kuo-tsai Wang, from the Taiwan Forestry Research Institute, says, "Without realizing it, the addition of something may affect the color of the paper or harm the quality of the paper." For example, alum is an acidic substance which causes paper to age rapidly, and starch will cause the paper to dry, crack, and grow bacteria. Bleaching agents destroy the fiber easily.
「加填的物質，常在不知不覺中損及紙色，傷害紙質」，王國財說，比如明礬是酸性物質，它會加速紙張的老化；而澱粉會導致紙張乾裂，又容易滋生黴菌；漂白劑則會分解破壞紙張纖維……。