photochromy

noun
pho·​to·​chro·​my | \ˈfōtəˌkrōmē\
plural -es

Definition of photochromy 

: a formerly used process of color photography in which a silver chloride emulsion layer assumes approximately the color of the exposing light

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History and Etymology for photochromy

International Scientific Vocabulary phot- + -chromy

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