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Professor J. Schulze
Professor J. Schulze mixes chalk, nitric acid, and silver in a flask; notices darkening on side of flask exposed to sunlight. Accidental creation of the first photo-sensitive compound. -
Thomas Wedgwood
Thomas Wedgwood makes "sun pictures" by placing opaque objects on leather treated with silver nitrate; resulting images deteriorated rapidly, however, if displayed under light stronger than from candles. -
Henry Fox
Henry Fox Talbot creates permanent (negative) images using paper soaked in silver chloride and fixed with a salt solution. Talbot created positive images by contact printing onto another sheet of paper. -
16th century
Brightness and clarity of camera obscuras improved by enlarging the hole inserting a telescope lens -
17th century:
Camera obscuras in frequent use by artists and made portable in the form of sedan chairs