字迹耐久性一方面取决于字迹色素的稳定性，还取决于色素与纸张的结合方式。字迹色素与纸张的结合方式通常分为三类，即结膜、吸收和粘附。以结膜方式结合的字迹有墨迹、印泥字迹、印刷油墨字迹等；以吸收方式结合的字迹有蓝黑墨水字迹、纯蓝墨水字迹和其它颜色的染料墨水字迹 Handwriting durability, on the one hand, depends on the stability of handwriting pigments, but also depends on the combination of pigment and paper. The combination of handwriting pigment and paper is usually divided into three categories, namely conjunctiva, absorption and adhesion. The conjunctions in the form of conjunctiva ink, inkpad, printing ink handwriting; combined with the absorption of handwriting blue ink, black ink handwriting and other colors of dye ink handwriting