Abstract: Objective Explore the feasibility of using the integrated optical density value to judge the formation time of inscriptions. Methods Through the experiment， using Image-pro plus software to collect and record the integrated optical density data of the experimental samples of different time periods, and using the relevant data and analysis method to count and analyze the integral optical density data of three kinds of brand printing oil and printing mud cover inscriptions. Results It was found that the numerical value decreased rapidly during the period of 1-120 d, and the it decreased slowly during the period of 120-380 d. The value basically tends to be stabilized after 380 d. Conclusion it is considered that the integral optical density value of the inscription decreases with the increase of the formation time, and the numerical value tends to be stable after a certain time ,and the correlation is more obvious within 120 d.

Key words: printed ink; inetgral optical density ; forming time

摘要： 目的 探讨利用积分光密度值判断印文形成时间的可行性，方法 通过实验，利用 Image-pro plus 软件对不同时间段实验样本的印文积分光密度值数据进行采集、录入，并运用相关数据分析方法，对实验用三种品牌印油、印泥盖印印文的积分光密度值数据进行统计、分析。结果 发现在1～120 d间数值下降速度较快，在120～380 d间数值减小幅度变缓，380 d后数值基本趋于稳定。结论 随形成时间的延长印文的积分光密度值减小，一定时间后数值大小趋于稳定，在120 d内关联性较明显。

关键词: 印文墨迹；积分光密度法；历时变化