USA HISTORY

Detailed explanation-1: -Check the hardness of your eraser. Some erasers, like those designed to remove pen or soft lead from paper, will naturally be harder than gum erasers or other soft types. However, over time, your eraser can lose elasticity and become so hard that it simply will no longer erase.

Detailed explanation-2: -Quick Fix: Use a nail file or fine grain sandpaper to scrape off a light layer from eraser. Conclusion: Works almost every time but works best on plain erasers (shown below). Always keep a nail file or a small square of sandpaper handy in your pencil pouch.