Pen Ink Sac Disappear Fade Replaceable Self-Vanishing Pen Groove Practice Copybook Special Ink Magic Pen 钢笔墨囊消失褪色可替换褪色钢笔凹槽练字贴专用墨水神奇魔笔

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    Magic Calligraphy Fade Ink Cartridge uses eco-friendly ink, which allows for smooth writing and vivid ink. However, the written characters will disappear automatically within about 30 minutes. The time it takes for the ink to fade varies from 30 minutes to 24 hours, which is mainly influenced by the different types of paper, air temperature, humidity, and writing speed. The color of the ink is only deep blue.

 Due to the volatile nature of ink, if you encounter a situation where the pen doesn't write, please clean the pen and reinstall the ink cartridge. You can also shake the pen downwards to allow the ink to reach the tip (this method can also be used if the pen has been unused for a long time).