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Daguerreotype process

first commercially successful photographic process, invented by L. Daguerre in 1839: a silver-plated copper sheet is treated to make light-sensitive, exposed in a camera, developed with mercury vapor, treated to remove light-sensitivity, gilt, sealed

Pronunciation
/dəˈɡɛrətʌɪp ˈprəʊsɛs/
/dəˈɡɛrəˌtaɪp ˈproʊˌsɛs/