The ink allows you to see different colors in shades and bleeds, and the color changes depending on the time and the paper you write. While conventional products were primarily used with a special paper, the color change is prevalent, the "flickering ink" can be enjoyed even on regular high-quality paper. The different writing on a variety of paper and the passage of time will show different expressions, so you can not only use it as a fountain pen ink, but also use a dip pen or glass pen to create a wide range of "swaying" colors.