tithonizationn.
/ˌtɪθənʌɪˈzeɪʃn/, /ˌtʌɪθənʌɪˈzeɪʃn/, U.S. /ˌtɪθənəˈzeɪʃ(ə)n/, /ˌtɪθəˌnaɪˈzeɪʃ(ə)n/, /ˌtaɪθənəˈzeɪʃ(ə)n/, /ˌtaɪθəˌnaɪˈzeɪʃ(ə)n/ Photography. rare. Now historical.
In the terminology of John William Draper: the photochemical changes caused by exposure to tithonic rays, esp. those on a photographic plate. Cf. tithonize v.
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the world > matter > physics > electromagnetic radiation > light > scientific effects of light > [noun] > energy causing chemical changes
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tithonization1844
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1844 J. W. Draper in London, Edinb., & Dublin Philos. Mag. 25 7 The indigo ray forms the muriatic acid as well as produces the preliminary tithonization.
2005 Stud. Hist. & Philos. Sci. A 36 501 A peculiar property of tithonic rays: unfixed photographic plates gradually lose their tithonization.
This entry has been updated (OED Third Edition, January 2018; most recently modified version published online March 2022).
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n.1844