We Don't Know The Real Purpose Of These Things. Take A Look
We generally assume this fact that the blue part of your eraser is to erase the pen marks. But that isn't entirely true. It's main purpose was something different initially.
The blue part was originally intended to remove markings from thick paper. The pink part can often leave traces of what was written behind on the paper, whereas the blue part generally gets rid of everything. But we ended up assuming that it was to erase stuff written with ink.
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