If you draw on a wall / table with a marker it will dry almost immediately and won’t come off easily, so how do whiteboards get around that?
In: Chemistry
The type of ink in the dry erase markers are formulated to sit on top of a surface. Also, the whiteboard itself is non-porous (doesn’t absorb), or nearly so, so the ink just sits on top without sinking in. This is why you can get some staining on old whiteboards. The coating that makes them non-porous gets worn.
Fun fact, you can use dry erase markers on any non-porous flat surface, and it’ll wipe off the same.
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