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Sabattier effect

American  
[sah-buh-tyey, sab-uh-] / ˌsɑ bəˈtyeɪ, ˌsæb ə- /

noun

Photography.
  1. the alteration of the image tones of a photographic print by briefly reexposing the negative after it has been partially developed.


Etymology

Origin of Sabattier effect

1925–30; Sabattier, erroneous for Armand Sabatier (1834–1910), French physician and scientist, who developed the effect