The Zhu Mo timing inspection project is one of the more difficult tasks in document inspection projects. Its difficulty lies in the fact that it is difficult to distinguish the hierarchical relationship between ink and text strokes under a regular microscope. The situation of mutual solubility between the two often occurs. How to find an intuitive method for observing and recording results has been extensively researched and discussed by domestic document inspectors. Today, we will introduce a practical method for timing inspection of vermilion ink: the video microscopy inspection method using excited fluorescence and transmitted white light. This method is intuitive, simple, and practical for the timing inspection of ink containing fluorescent substances.