Which of the following drawing materials cannot be smudged or rubbed for a hazy effect?

Question

Quizplus · Accepted Answer

Metalpoint is a technique where a metal wire is used to create lines on a specially prepared surface. Once the metal wire makes contact with the surface, it leaves a permanent mark and cannot be smudged or rubbed for a hazy effect. The other materials listed are all soft and can be smudged or rubbed to create a hazy effect.

Which of the Following Drawing Materials Cannot Be Smudged or Rubbed