knetgummi

Knetgummi, known in English as kneaded eraser, is a pliable eraser used in drawing and drafting. It is a soft putty-like material that can be shaped by hand and pressed onto the paper to remove graphite, charcoal, or pastel by lifting pigment rather than rubbing the surface. Unlike rigid erasers, it can be shaped to fit edges, corners, or small areas, allowing selective lightening or highlights.

Knetgummi is typically made from natural or synthetic rubber and may be gray, white, or pink. It deforms easily, collects graphite dust on its surface, and can be rejuvenated by kneading to reveal a fresh surface. After use, it often carries graphite on its exterior and should be cleaned by kneading or by using a clean scrap of paper.

Artists employ kneaded erasers to create soft edges, adjust tonal values, and lift away graphite from selected areas. They are especially useful for creating highlights in graphite or charcoal drawings. They are not suitable for erasing ink or other non-erasable media and may smear if used with oily pigments.

The eraser can dry out and crack if left unused, and excessive pressure can tear the material. It leaves graphite residue on the eraser and can pick up fibers from paper. To maintain performance, knead regularly to expose fresh material and store away from direct heat or sunlight.

Kneaded erasers have been used since the early 20th century and are common in art and technical drawing. They are sold by many brands and marketed under the generic name Knetgummi in German-speaking markets.