The reason why the whiteboard pen can't float is that it uses ink, which is insoluble in water. So the water with pigment will float. Write on the smooth desktop with a whiteboard pen, and then pour 1:25 salt water to cover the words. It must be smooth, preferably with glass and mirrors. It is easier to float when shaking slightly.

Unlike an easy-to-erase whiteboard pen, the handwriting of an oily marker pen is strong enough on a smooth surface, and it is difficult to wash it off with water only. So you can use an oily marker to draw the background and the patterns that you don't want to wash away, plus a whiteboard pen.

Although the ink of these pens is low toxic, they still need to be carefully cleaned after playing.

Market brand:

Market brands are: Japanese Yali, Platinum, Longfei, Shide Building, Toyo, Zebra, Lion, Bike, East Asia and Qi Xin.

(Note:) The ink materials of whiteboard pens are mainly pigments and alcohol. Because alcohol is volatile, easy to wipe, quick-drying and bright, in the same way, you should pay attention to wearing a pen cap after writing. This factor is the most prone to mistakes, so that the whiteboard pen can be used quickly.

However, the ink produced by a few domestic and foreign manufacturers has excellent moisturizing performance. For example, one in South Korea and one in Jiangmen, Guangdong, China will not dry up after opening the pen cap for dozens of hours, which is the direction that other domestic ink manufacturers need to move forward.