Dry erase markers work because they use a specific type of ink that allows the markings to be easily wiped away. The key to this lies in the ink's composition.
Here's a breakdown of how it works:
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The Ink's Special Ingredient: Dry erase markers contain an oily silicone polymer. This is the crucial difference between dry erase and permanent markers.
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Slippery Surface: The silicone polymer makes the ink slippery. This prevents the colored pigment in the marker from directly bonding to the whiteboard surface.
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Easy Removal: Because the pigment doesn't adhere strongly, it can be easily wiped off with a dry cloth or eraser. The silicone polymer essentially acts as a release agent.
In comparison, permanent markers use an acrylic polymer, which creates a strong bond with the surface, making the ink difficult to remove.
