eraser dust

The brush is needed to whisk eraser dust away. The chief advantage of this eraser is that it may be sharpened to a point to erase a very small area.

Eraser dust, which can be purchased or made by the conservator by grating an eraser, is sprinkled on a very small section of the area to be cleaned and gently rubbed with a brush.

The handwritten, chalkboard type is called eraser dust.