What purpose does kneaded eraser serve?

A kneaded eraser serves the purpose of lightening values without leaving crumbs, making it particularly useful in drawing and sketching. This type of eraser is made of a pliable material that can be molded into different shapes, allowing artists to lift graphite or charcoal from the paper in a way that maintains the integrity of the surface.

When artists want to create highlights or soften shadows, they can gently dab or knead the eraser onto the drawing, effectively lifting away some of the medium without damaging the paper or smudging. This capability is crucial for achieving subtle tonal variations and maintaining fine details in artwork.

The other methods listed do not apply to the function of a kneaded eraser. For instance, while applying color or blending colors may involve different tools or techniques, kneaded erasers specifically excel in their unique ability to erase without any residue, which is essential for precision and control in an artist's work.