Etching: Acid, Metal, and the Print That Changed Art

Etching was invented by a man who decorated armor. Daniel Hopfer worked in Augsburg, Germany, in the 1490s, using acid to etch ornamental designs onto steel plates and helmets. At some point around 1500, he had an idea that seems obvious in retrospect but was not obvious at the time: if you can etch a design into a metal plate, you can ink that plate and press it onto paper to make a print. Hopfer started pulling prints from etched iron plates, and within two decades, Albrecht Durer, Parmigianino, and Pieter Bruegel the Elder were all making etchings of their own.

Etching is an intaglio printmaking technique in which a metal plate is coated with an acid-resistant ground, drawn into with a needle, and then submerged in acid. The acid bites into the exposed metal, creating lines that hold ink. The ground is removed, ink is rubbed into the lines, the surface is wiped clean, and damp paper is pressed against the plate under high pressure. The result is a print whose lines have the freedom and spontaneity of a drawing, because the artist drew them freely through soft wax rather than carving them laboriously into metal with a burin.

This entry covers how etching works, where it came from, which artists defined it, and how to read an etching when you see one in a museum. If you want to understand why etching became the most expressive printmaking technique for four centuries, the answer is in the relationship between the needle, the wax, and the acid.

How Etching Works: The Chemistry of a Drawing

The core principle of etching is that acid dissolves metal. A copper or zinc plate is polished smooth and coated with a thin layer of acid-resistant material called the ground. Traditional grounds are made from wax, asphaltum, and rosin, melted onto the warm plate and spread into an even film. The artist draws through this ground with an etching needle, a sharp steel point that exposes the metal beneath. Every line drawn becomes a channel for acid.

The plate is then immersed in an acid bath. Historically, nitric acid or hydrochloric acid was used. Modern printmakers often use ferric chloride, which is less toxic and produces a smoother bite. The acid eats into the exposed metal, deepening the drawn lines. The longer the plate sits in the acid, the deeper and darker the lines will print. An etcher can control tonal range by removing the plate from the acid, covering certain lines with stop-out varnish, and returning the plate to the bath for additional biting. This staged process allows for lines of varying depth and darkness within a single plate.

What makes etching different from engraving is the drawing surface. An engraver pushes a burin through solid metal, which requires considerable force and precision. An etcher draws through soft wax, which requires no more pressure than drawing on paper. This is why etched lines look like drawn lines. They have the same freedom, the same variation in pressure, the same ability to wander, hesitate, and change direction. The Albertina Museum in Vienna, in its 2020 exhibition on the Renaissance of Etching co-organized with the Metropolitan Museum of Art, described etching as coming "closer to actual drawing than all other printmaking techniques." You can read the exhibition materials at the Albertina Museum.

Origins and History

Etching grew out of armor decoration. Goldsmiths and armorers in 15th-century Germany and Italy used acid to etch designs into metal surfaces, a technique that goes back to late antiquity. Daniel Hopfer (c. 1470-1536) was the first to apply this process to printmaking. His early etchings were made on iron plates, which produced rough, dark lines. The technique spread quickly because it was accessible. Unlike engraving, which required years of training with a burin, etching allowed any artist who could draw to make a print.

The switch from iron to copper plates happened in the Netherlands around 1520. Lucas van Leyden was among the first to etch on copper, which is softer and produces finer, cleaner lines than iron. A 2024 study published in the Journal of Historians of Netherlandish Art by Olenka Horbatsch examined the earliest Netherlandish etchings, including Lucas van Leyden's portrait of Maximilian I (1520) and Jan Gossart's portrait of Charles V (1520). Horbatsch argues that Lucas was the first European artist to combine etching with engraving on a single copper plate, a hybrid technique that exploited the strengths of both methods. The study is available at JHNA.

By the 17th century, etching had become the preferred printmaking medium for painters. Rembrandt produced around 300 etchings over his career, pushing the technique further than anyone before him. The 18th century saw etching decline as a fine art medium, associated increasingly with commercial reproduction. But the mid-19th century brought the Etching Revival, led by Charles Meryon, James McNeill Whistler, and Odilon Redon, who reestablished etching as an original art form. The Delaware Art Museum's 2025 exhibition Inked Impressions: Etchings in the Age of Whistler traced this revival across France, Britain, and the United States. Details are at Delaware Art Museum.

Key Artists Who Etched

Daniel Hopfer (c. 1470-1536)

Hopfer is the inventor of etching as a printmaking technique. Working as an armor decorator in Augsburg, he adapted the acid-etching process used on steel armor to produce prints on paper. His early works on iron plates have a rough, vigorous quality. The Metropolitan Museum of Art and the Albertina Museum jointly organized the 2019-2020 exhibition The Renaissance of Etching, which traced Hopfer's innovation and its rapid spread across Europe. As Met curator Nadine M. Orenstein noted, Durer's adoption of etching gave the technique instant credibility: "Whatever he did, people were looking at."

Albrecht Durer (1471-1528)

Durer produced a small number of etchings, including The Agony in the Garden (1515), working on iron plates. His etchings are less famous than his engravings, but they demonstrate how quickly a master draftsman could adapt the new medium. Durer's etchings show the characteristic freedom of the drawn line, though the iron plate produced a coarser result than later copper etchings would achieve.

Rembrandt van Rijn (1606-1669)

Rembrandt is the greatest etcher in the history of the medium. He produced approximately 300 etchings, often combining etching with drypoint and aquatint-like tonal effects. The Three Crosses (1653) exists in multiple states, each dramatically reworked, showing how Rembrandt treated the copper plate as a living surface that could be revised and reimagined. Christ Healing the Sick (c. 1648), known as "The Hundred Guilder Print," combines etched lines with drypoint burr to create tonal passages of extraordinary depth. The Dallas Museum of Art catalogued its Rembrandt print collection in 2025, identifying watermarks to distinguish lifetime impressions from posthumous ones. Read about the project at Dallas Museum of Art.

Francisco Goya (1746-1828)

Goya used etching combined with aquatint to create the most politically powerful prints in Western art. Los Caprichos (1799), a series of 80 prints, satirized Spanish society, the clergy, and superstition. Los Desastres de la Guerra (1810-1820) depicted the horrors of the Peninsular War with unflinching directness. In 2024, the Real Academia de Bellas Artes de San Fernando in Madrid exhibited all 213 of Goya's surviving copper plates together for the first time, alongside prints pulled from them. The plates had been restored by removing 19th-century steel facing to reveal the original copper surfaces. Javier Blas, one of the curators, pointed to the plates and said: "Goya's hand is right here. Here you can see how he engraved with etching, aquatint and then the direct touches with a burin." Read the full story at El Pais.

James McNeill Whistler (1834-1903)

Whistler was the central figure of the Etching Revival. His French Set (1858) and Thames Set (1859-1861) reestablished etching as a fine art medium after a century of association with commercial reproduction. Whistler treated each impression as a unique work of art, varying the inking and printing to produce different effects from the same plate. The University of Glasgow's Whistler Etchings Project has catalogued 490 etchings by Whistler, tracing the evolution of each plate through multiple states. Some etchings went through twenty states before Whistler was satisfied. Explore the catalogue at University of Glasgow.

How to Spot an Etching

The telltale sign of an etching is the quality of the line. Etched lines are freer, more varied, and more spontaneous than engraved lines. They swell and taper with the pressure of the needle. They change direction without the mechanical precision that a burin produces. If a line looks like it was drawn with a pen rather than carved with a chisel, it is probably etched.

Look for plate tone. Etchers often leave a thin film of ink on the surface of the plate rather than wiping it completely clean, producing a subtle tonal haze that fills the background. Rembrandt used this effect extensively, varying the wipe from impression to impression. You can see this in his Landscape with a Cottage and Hay Barn (1641) at the Rijksmuseum, where the sky is not white paper but a warm, tonal field created by surface ink.

Etchings are typically printed on dampened paper, which is forced into the incised lines under the pressure of a rolling press. The plate leaves a visible indentation on the paper called the platemark. If you see a platemark, you are looking at an intaglio print, either an etching, an engraving, a drypoint, or a mezzotint. The line quality tells you which one.

Related Techniques

Etching belongs to the intaglio family of printmaking, which includes engraving, drypoint, aquatint, and mezzotint. Engraving uses a burin to carve lines directly into metal, producing clean, controlled marks. Drypoint uses a needle to scratch lines, creating a burr that prints with a velvety richness but wears out quickly. Aquatint is an etching variant that uses powdered rosin to create tonal areas rather than lines. Mezzotint roughens the entire plate surface and then smooths areas to create light, working from dark to light.

Etching is the opposite of relief printing, where the raised surface of a block carries the ink. In etching, the ink sits in the recessed lines below the surface. Lithography, by contrast, is a planographic process that prints from a flat surface using the resistance between oil and water. For more on how printmaking techniques compare, read our guide on how to read a painting, or explore our entry on chiaroscuro to see how light and shadow work in printed images.

See Etching in Person

Etchings are best seen in museum print rooms, where you can examine the line quality and platemark up close. The Rijksmuseum in Amsterdam holds the largest collection of Rembrandt etchings, including multiple states of major prints. The Metropolitan Museum of Art in New York has an extensive collection of Durer, Goya, and Whistler etchings. The Real Academia de Bellas Artes de San Fernando in Madrid holds Goya's original copper plates, now restored to their original copper state.

If you want to trace the history of etching, start with Hopfer and Durer at the Met or the Albertina, move to Rembrandt at the Rijksmuseum, then to Goya at the Prado or the San Fernando Academy, and end with Whistler at the Hunterian Art Gallery in Glasgow or the Freer Gallery in Washington. You will see a technique that began as a byproduct of armor decoration and became the most expressive printmaking medium in Western art. For more on the broader context of printmaking, read our entries on intaglio and drypoint, or explore our post on chiaroscuro and dramatic contrast to see how etchers used tonal effects in their prints.