There are three types of Eraser brush variants: Eraser, Bleach, and Darkener. Eraser brush variants erase down to the paper color. Bleach brush variants erase to white, gradually lightening by removing color. Darkener brush variants are the inverse of Bleach variants. Darkener brush variants gradually increase color density, building colors toward black. With all Eraser brush variants, pressure determines how much you erase.