Air erasers are air powered. The principle of operation is similar to that of
sandblasting. Isolate unwanted areas and protect the rest of the drawing by
masking with a frisket or masking tape. With a special airbrush and a
compressor, eraser particles are shot at 35 pounds-per-square inch (PSI) at
the drawing until the erasure is complete. You cannot use an airbrush
intended for pigments because the size and nature of the abrasive grit will
ruin the delicate parts of an airbrush intended for pigment.