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Mordançage
Mordançage is an alternative photographic process that alters silver gelatin prints to give them a degraded effect. The mordançage solution works in two ways: it chemically bleaches the print so that it can be redeveloped, and it lifts the black areas of the emulsion away from the paper giving the appearance of veils. Once the emulsion is lifted, it can then be removed or manipulated depending on the desired outcome. Areas where the emulsion was removed appear to be in relief. These prints can become oxidized during their creation, further altering the tonality of the image.
== History ==
Mordançage was created by Jean-Pierre Sudre during the 1960s. While he is credited with the creation of Mordançage, it is based on a late 19th-century process known as etch-bleach. This process has also been referred to as bleach-etch, gelatin relief, or reverse relief. Etch-bleach was first documented in 1897 by Paul Liesegang〔Liesegang, Paul (1898). ''Die Collodion Verfahren mit Jod und Bromsalzen''. Leipzig.〕 and was originally used as a reversal process for film negatives.〔 Within a year, a man named Andresen suggested using hydrogen peroxide and hydrochloric acid in the process in the place of ammonium persulfate. Later references to the etch-bleach process show a chemical composition that is very close to that of mordançage - the only difference being the use of citric acid in place of glacial acetic acid. Sudre refined this technique and dubbed it "mordançage." His process has since been adopted by some of his students, and has spread from there.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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