1. Alcohol whiteboard water based pen ink (1) the ink is the alcohol based pigment ink (2) can be wiped off when you finish the writing (3) the ink can stand on the board for a long time (4) there is no special requirement for enviroment. 2. Water based whiteboard pen ink (1) The ink is water baesd pigment ink which is alcohol-free. (2) There is no damage for the board (3) The time of leaving the cup is long
