Calotype ortalbotype is an earlyphotographic process introduced in 1841 byWilliam Henry Fox Talbot,[1] usingpaper[2] coated withsilver iodide.Paper texture effects in calotype photography limit the ability of this early process to record low contrast details and textures.
The termcalotype comes from theAncient Greekκαλός (‹See RfD›kalos), "beautiful", andτύπος (‹See RfD›typos), "impression".
Talbot made his first successful camera photographs in 1835 using paper sensitised withsilver chloride, which darkened in proportion to its exposure to light. This early "photogenic drawing" process was aprinting-out process, i.e., the paper had to be exposed in the camera until the image was fully visible. A very long exposure—typically an hour or more—was required to produce an acceptablenegative.
In late 1840, Talbot worked out a very differentdeveloping-out process (a concept pioneered by thedaguerreotype process introduced in 1839), in which only an extremely faint or completely invisiblelatent image had to be produced in the camera, which could be done in a minute or two if the subject was in bright sunlight. The paper, shielded from further exposure to daylight, was then removed from the camera and the latent image was chemicallydeveloped into a fully visible image. This major improvement was introduced to the public as thecalotype ortalbotype process in 1841.[3]
The light-sensitivesilver halide in calotype paper wassilver iodide, created by the reaction ofsilver nitrate withpotassium iodide. First, "iodised paper" was made by brushing one side of a sheet of high-quality writing paper with a solution of silver nitrate, drying it, dipping it in a solution of potassium iodide, then drying it again. At this stage, the balance of the chemicals was such that the paper was practically insensitive to light and could be stored indefinitely. When wanted for use, the side initially brushed with silver nitrate was now brushed with a "gallo-nitrate of silver" solution consisting of silver nitrate,acetic acid andgallic acid, then lightly blotted and exposed in the camera. Development was effected by brushing on more of the "gallo-nitrate of silver" solution while gently warming the paper. When development was complete, the calotype was rinsed, blotted, then either stabilized by washing it in a solution ofpotassium bromide, which converted the remaining silver iodide intosilver bromide in a condition such that it would only slightly discolour when exposed to light, or "fixed" in a hot solution ofsodium thiosulphate, then known ashyposulphite of soda and commonly called "hypo", which dissolved the silver iodide and allowed it to be entirely washed out, leaving only the silver particles of the developed image and making the calotype completely insensitive to light.
The calotype process produced atranslucent original negative image from which multiplepositives could be made by simplecontact printing. This gave it an important advantage over the daguerreotype process, which produced an opaque original positive that could be duplicated only by copying it with a camera.
Although calotype paper could be used to make positive prints from calotype negatives, Talbot's earlier silver chloride paper, commonly calledsalted paper, was normally used for that purpose. It was simpler and less expensive, and Talbot himself considered the appearance of salted paper prints to be more attractive. The longer exposure required to make a salted print was at worst a minor inconvenience when making a contact print by sunlight. Calotype negatives were often impregnated with wax to improve their transparency and make the grain of the paper less conspicuous in the prints.
Talbot is sometimes erroneously credited with introducing the principle of latent image development. The bitumen process used in private experiments byNicéphore Niépce during the 1820s involved the chemical development of a latent image, as did the widely used daguerreotype process introduced to the public by Niépce's partner and successorLouis Daguerre in 1839. Talbot was, however, the first to apply it to a paper-based process and to a negative-positive process, thereby pioneering the various developed-out negative-positive processes which have dominated non-electronic photography up to the present.
Despite their flexibility and the ease with which they could be made, calotypes did not displace the daguerreotype.[5]
In part, this was the result of Talbot havingpatented his processes in England and beyond. Unlike Talbot, Daguerre who had been granted a stipend by the French state in exchange for making his process publicly available, did not patent his invention.[5] In Scotland, where the English patent law was not applicable at the time, members of theEdinburgh Calotype Club and other Scottish early photographers successfully adopted the paper-negative photo technology.[6] InEngland, the Calotype Society was organized in London around 1847 attracting a dozen enthusiasts.[7] In 1853, twelve years after the introduction of paper-negative photography to the public, Talbot's patent restriction was lifted.[8]
In addition, the calotype produced a less clear image than the daguerreotype. The use of paper as a negative meant that the texture and fibers of the paper were visible in prints made from it, leading to an image that was slightly grainy or fuzzy compared to daguerreotypes, which were usually sharp and clear.[5][9] Nevertheless, calotypes—and thesalted paper prints that were made from them—remained popular in theUnited Kingdom and on the European continent outside France in the 1850s, especially among the amateur calotypists, who prized the aesthetics of calotypes and also wanted to differentiate from commercial photographers,[10] until thecollodion process enabled both to makeglass negatives combining the sharpness of a daguerreotype with the replicability of a calotype later in the nineteenth century. British photographers also brought the calotype toIndia, where, for example, in 1848,John McCosh, a surgeon in theEast India Company, took the first image of theMaharajah Duleep Singh.[11]
