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Pens were never designed to be erased. Once you leave marks, the ink soaks to the paper to make it permanent. And that's how it was for the longest time. If you wanted to make corrections, you'd have to reach to your correction fluids, you correction tapes in order to fix mistakes. And you could use things like the sand eraser. It physically shaves off the top layer of the paper to remove the ink particles and the part of the paper. But that is inconsistent, it gets messy and it can create holes in your pages. It's not a great. Pilot came out with the FriXion pen. It's a functional erasable pen. Now, how do you create erasable pens? There are two parts to the solution. The first part is the ink. Pilot had a patent for a very long time where the ink color can shift on heat and for decades perfecting that ink. And eventually got that ink to go fully transparent after heat was applied. So that's the first step to the solution. But the next question is, how do you apply heat to a specific location where you'd want to erase? And that's where the top part of the FriXion pen comes in. It's this slippery material that looks like an eraser as you're trying to erase your markings, it generates heat on the paper. Because it's only generating heat on that specific location, that area disappears. You're not physically removing any ink off the paper. You're just changing the properties of the ink. Which is very clever and it was revolutionary in Europe because students were required to write in pen. Although, there are some downsides to an erasable pen. Because it is heat-sensitive, if you leave your writings on somewhere warm, it can all disappear. It's been quite a while since they first released it. Now you get more colors in various sizes, they have made a lot of changes, they have made some updates, it's a much improved product compared to how it was at the beginning.