A photographic process patented by William Henry Fox Talbot in England and Wales on 8 February 1841, also known as Talbotype.The process was a significant enhancement of Talbot s photogenic drawing process and used silver iodide combined with gallic acid to enhance its sensitivity. After exposure the paper was developed to produce a negative and then chemically fixed to make it permanent. The calotype was the first negative/positive process and it provided the basis of modern photography. See: Art of Printmaking.
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