The word "etch" entered English in the 1630s from Dutch etsen, which came from German ätzen (to etch, to corrode). The German word is a causative form of essen (to eat), from Old High German azzen (to feed, to cause to eat), derived from the base verb ezzan (to eat). The causative formation is significant: ätzen does not mean "to eat" but "to cause to eat" — when an artist etches, they are making acid eat into a metal surface. The PIE root *h₁ed- (to eat) is the ultimate ancestor, also producing English "eat," Latin edere (to eat), and Greek edein (to eat).
The technique of etching revolutionized printmaking in the 16th and 17th centuries. Before etching, engraving required the artist to cut lines directly into a metal plate using a burin — a demanding physical skill that limited the medium to those with years of training. Etching freed the artist from this constraint: the plate is coated with an acid-resistant ground, the artist draws through the ground with a needle (which requires no special force), and then the plate is immersed in acid, which eats into the exposed metal where the needle has drawn. The result is a plate with incised lines that can be inked
Rembrandt van Rijn elevated etching to the level of high art. His approximately 300 prints, created between the 1620s and the 1660s, demonstrated tonal and atmospheric effects that had previously been associated only with painting. Prints like The Three Crosses and Christ Healing the Sick achieved such fame and such prices that they rivalled his paintings in reputation and value.
The figurative use of "etch" — as in "etched in memory" or "etched on one's face" — draws on the permanence and precision of the process. An etched line cannot be erased; it has been chemically consumed into the surface. When we say an experience is "etched in memory," we invoke this permanence: the memory has been burned in, consumed into the mental surface, and cannot be smoothed away.
Modern semiconductor manufacturing uses etching as a fundamental process: acid or plasma "eats" precise patterns into silicon wafers to create the microscopic circuits of computer chips. This industrial application of the ancient technique connects Rembrandt's art to the digital age through the same underlying principle: controlled corrosion, the deliberate feeding of material to a chemical agent.