It was commercially introduced in 1839, a date generally accepted as the birth year of practical photography. The metal-based daguerreotype process soon had some competition from the paper-based calotype negative and salt print processes invented by William Henry Fox Talbot
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Answer: <u> </u><u>3</u><u>0</u><u>%</u><u> </u><u> </u><u>decrease</u><u> </u>
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