The oldest and most difficult form of Intaglio printmaking is mezzotint, which involves roughening a plate and then smoothing it to create tonal variations. Other methods like engraving, drypoint, and etching are generally less challenging. Mezzotint requires more skill and time, emphasizing its complexity in the printmaking process. ;
Mezzotint is the oldest and most difficult form of intaglio printmaking, known for its demanding technique of creating tonal images. In contrast, engraving, drypoint, and etching are generally easier to master. The chosen answer is c. mezzotint.
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