An eraser isn't just for erasing! It also allows you to draw in the negative. How it works You are going to open white areas in a grayed-over surface, that is, you are going to erase certain areas down to the white paper, creating areas of light.
What you need to know:
A kneaded eraser is used with unstable media such as charcoal, chalk, and sanguine. The classical rubber eraser is better for graphite leads.
Kneaded erasers but for dabbing the area to be lightened, rather than for rubbing.
Knead it before using it to give it the right shape.
It's easy to clean: knead it until it completely absorbs all the pigment.