...or at least I thought so, when I saw that the ink that was on my whiteboard last night became really messed up the next day.
The image below shows my whiteboard before (on the left) and after (on the right). The time span was one night.
As you can see, the words became really squiggly, and they mostly travelled downwards.
When I woke up, a few hours before I noticed my whiteboard mess, I noticed lots of condensation water on my whiteboard due to my air-conditioner (my whiteboard is made of glass, if it matters).
My theory is that the water pushed the oil surfactant* of the marker ink mostly downwards. The oil surfactant in the ink coats the board to ensure easy erasing, so the oil should be the closest chemical to the board. Since oil and water are immiscible, the hydrophobic oil ended up being pushed away by the sliding condensed water (sliding due to gravity) and the ink travelled down.
However, my theory does not explain why the ink travelled upwards in some parts of the board. I have not shown it here due to sensitive information.
Is my theory lacking? What do you guys think about this phenomenon? And no, it wasn't a prank.
Can the ink travelling in directions other than downwards be explained?
*Regarding ingredients, all alcohol-based dry-erase marker inks contain 4 basic ingredients:
- Release agent- an oily (can be simply a mineral oil) surfactant or co- solvent which will coat the board to provide easy erase barrier (such that the colorant slides off of the board surface and does not penetrate or stain over time)