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
Regular markers contain a single solvent that evaporates, leaving the ink firmly attached to the surface. Whiteboard markers contain two solvents. The first evaporates, leaving the ink in the second, less fluid, solvent, so it’s reasonable durable but can be wiped off.
The second solvent evaporates over time, so very old writing on whiteboards becomes almost as difficult to remove as permanent marker.
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