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Livink Pen is the one with the ink that will disappear after a period of time, and the time duration of the ink can be adjusted by rotating the pen body. The ink can disappear is because it is a water-based acid-base indicator that changes from a colored to a colorless solution upon exposure to air. By adding sodium hydroxide with different proportions can adjust the reaction time between the ink and the air.
Livink Pen can be used in the writing on the blackboard as well as in the paper writing, so that you can not only save cleaning time but also recycle paper.