What technique,used by Martin Schongauer,did Dürer adapt to the woodcut medium in The Four Horsemen of the Apocalypse ?

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Dürer adapted the technique of metal engraving, which was used by Martin Schongauer in his prints. He used a burin to carve his design directly onto the surface of a wooden block, creating fine lines and intricate detail in his prints, such as in his famous series, The Four Horsemen of the Apocalypse.

What Technique,used by Martin Schongauer,did Dürer Adapt to the Woodcut