笔者首次提出了离子相对扩散比值法测定墨水书写时间。此方法对检材和样本不需多加注意被测试笔划粗细是否一致或接近,只要墨色浓淡和笔划走势方向一致(同为横划、竖划或斜划,考虑到纸张纤维方向的影响).提高了可被检验笔划的数量,有助于排除检测误差。在无可比对性样本时,笔者又提出了建立比值与时间的数据库。 The author first proposed the relative diffusion ratio of ions to determine the ink writing time. This method does not require much attention to the thickness and thickness of the pen to be tested for specimen and sample, as long as the ink color is in the same direction as the stroke (same as horizontal, vertical or oblique, taking into account the influence of the fiber direction of the paper). The number of strokes that can be checked helps to eliminate detection errors. In the absence of comparable samples, the author also put forward the establishment of the ratio and time database.