| In the spring of 1841, Henry Talbot patented this new negative process and called it the calotype. |
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| The first use of sensitized paper to produce a negative is invented by Talbot in 1840 and took the name of calotype or talbotype. |
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| These experiments led him to develop the calotype process, and the production, in 1835, of the first ever negative, a picture of the Oriel window at Lacock. |
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| The calotype was physically developed and fixed with a solution of sodium hyposulfite instead of a salt solution. |
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| From 1979 onward he became known internationally for photographic work in which he used the old calotype technique. |
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| To make a calotype, uncoated sheets of writing paper are covered with a silver nitrate solution, dried and then dipped in potassium iodide to make silver iodide. |
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| He was among the first of the French painters to recognize the aesthetic potentials of the calotype. |
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| In 1842 Talbot received a medal from the British Royal Society for his experiments with the calotype. |
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| The calotype could capture an image in one minute, a stunning efficiency when compared with the 15 to 30 minutes required for a daguerreotype. |
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| After a number of improvements, the process was made publicly available as the calotype process. |
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| The main advantages of the calotype were the easiness with which one could manipulate the paper prints and the possibility of multi-ptinting. |
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| To improve the calotype negative transparency, Abel Niépce de Saint-Victor had the idea in 1847 to replace paper with glass. |
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| He experimented with a series of photographic methods, attempting to find one that would allow him to capture movement without a blur, and he found some success with the calotype, patented in 1841 by William Henry Fox Talbot. |
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| When he tells how to kill a hog or make a fiddle, or refers to ambrotype, calotype and daguerreotype portraits, you know that he knows what he is writing about. |
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| He became famous in photography for having developed the first photographic technique on glass where all previous techniques on paper, the calotype for example, produced an intermediate negative. |
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| In 1841, he patented the calotype, the first negative-positive process that made it possible to multiply the same image because of an intermediate negative on a silver chloride paper made translucid with wax. |
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