Calotype by William Henry Fox Talbot (1800-1877). Fox Talbot invented the negative/positive process for producing photographs between 1835 and 1839. Any number of prints could be made from the same negative by transferring the negative image on to special paper to make a positive print; these prints were called calotypes. Calvert Richard Jones (1802-1877) was a friend of Talbot's and worked with him on the production of calotype negatives to produce prints for commercial sale. Lacock Abbey in Wiltshire, now open to the public and housing a photography museum, was Talbot's family home.
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