Double-colored erasers. The different-colored sides are used to erase marks made by different pencils on different types of paper. While the soft pinkish-orange side is used for light grades of paper and lighter pencil marks, the blue side is meant for grainier, tougher paper and darker marks. The blue side was later promoted for removing pen marks because a lot of people didn't understand what it was meant for.
It's correct though, I can remember all the publicity when they were first introduced.
So if I try to save your life, but you see that it will make you uncomfortable, can I assume you will pass on the help?
Yes, had me totally confused .