So, what exactly is the blue part of the eraser for?

In short: the truth about the blue half

No, it doesn’t erase ink.
Yes, it erases pencil—but only on solid surfaces.
And most of all, it remains a school memory many of us still cherish.

So the next time you come across a pink-and-blue eraser, remember: the blue side wasn’t useless… just misunderstood.

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