4. Blue Part Of Eraser

Most people think that the pink part of the eraser is for pencil marks and the blue part is for pen marks. This is not true. When you erase your pencil marks with the pink part, it’s not uncommon for some pencil’s smudges to be left behind.

The blue part is designed to remove any other pencil’s smudges. When the eraser producers realized that people did not understand the real reason for the blue part of the eraser, they started marketing it to remove pen marks. Many erasers even had a picture of a pen printed on the blue part of the eraser even though it was not for its original purpose.