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What (who) is échoppe - definition
![Relief etching by William Blake, frontispiece to ''[[America a Prophecy]]'' (Copy A, printed 1795)](https://commons.wikimedia.org/wiki/Special:FilePath/America a Prophecy copy a plate 01.jpg?width=200 "Relief etching by William Blake, frontispiece to ''[[America a Prophecy]]'' (Copy A, printed 1795)")
![Selection of early etched printing plates from the [[British Museum]]](https://commons.wikimedia.org/wiki/Special:FilePath/BM engraved printing plates.jpg?width=200 "Selection of early etched printing plates from the [[British Museum]]")
![Photograph of the necklace in question]]</ref>](https://commons.wikimedia.org/wiki/Special:FilePath/British Museum Middle East 14022019 Gold and carnelian beads 2600-2300 BC Royal cemetery of Ur (composite).jpg?width=200 "Photograph of the necklace in question]]</ref>")
![Etching by [[Jacques Bellange]], ''Gardener with basket'' c. 1612](https://commons.wikimedia.org/wiki/Special:FilePath/Gardener with a Basket on her Arm, from Hortulanae series MET MM10514.jpg?width=200 "Etching by [[Jacques Bellange]], ''Gardener with basket'' c. 1612")
Wikipedia
Etching is traditionally the process of using strong acid or mordant to cut into the unprotected parts of a metal surface to create a design in intaglio (incised) in the metal. In modern manufacturing, other chemicals may be used on other types of material. As a method of printmaking, it is, along with engraving, the most important technique for old master prints, and remains in wide use today. In a number of modern variants such as microfabrication etching and photochemical milling, it is a crucial technique in much modern technology, including circuit boards.
In traditional pure etching, a metal plate (usually of copper, zinc or steel) is covered with a waxy ground which is resistant to acid. The artist then scratches off the ground with a pointed etching needle where the artist wants a line to appear in the finished piece, exposing the bare metal. The échoppe, a tool with a slanted oval section, is also used for "swelling" lines. The plate is then dipped in a bath of acid, known as the mordant (French for "biting") or etchant, or has acid washed over it. The acid "bites" into the metal (it undergoes a redox reaction) to a depth depending on time and acid strength, leaving behind the drawing (as carved into the wax) on the metal plate. The remaining ground is then cleaned off the plate. For first and renewed uses the plate is inked in any chosen non-corrosive ink all over and the surface ink drained and wiped clean, leaving ink in the etched forms.
The plate is then put through a high-pressure printing press together with a sheet of paper (often moistened to soften it). The paper picks up the ink from the etched lines, making a print. The process can be repeated many times; typically several hundred impressions (copies) could be printed before the plate shows much sign of wear. The work on the plate can be added to or repaired by re-waxing and further etching; such an etching (plate) may have been used in more than one state.
Etching has often been combined with other intaglio techniques such as engraving (e.g., Rembrandt) or aquatint (e.g., Francisco Goya).
