Albrecht Dürer
(1471- 1528)

Albrecht Dürer sometimes spelled in English as Durer (without an umlaut) or Duerer, was a German painter, printmaker, and theorist of the German Renaissance. Born in Nuremberg, Dürer established his reputation and influence across Europe in his twenties due to his high-quality woodcut prints. He was in contact with the major Italian artists of his time, including Raphael, Giovanni Bellini, and Leonardo da Vinci, and from 1512 was patronized by Emperor Maximilian I.

https://en.wikipedia.org/wiki/Albrecht_Dürer

Saint Jerome in His Study
1514
Copper Engraving
24.6 x 18.9 cm
The MET
https://www.metmuseum.org/art/collection/search/336229

For an engraving no acid is used. The lines are cut in the metal with a burin.
https://en.wikipedia.org/wiki/Burin_(engraving)
A careful and steady hand is needed: mistakes are almost impossible to correct.