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" When the Day's Work is Done" by H.P. Robinson In 1851, Frederick Scott Archer invented the wet plate collodion process. This involves flowing a clear gel (collodion) across a glass or metal plate, sensitizing it, and then exposing, while still wet (hence the name), the resulting light-sensitive plate. This process provides a highly detailed negative image when performed on clear glass. These negatives can be quite large. While the process is more cumbersome than the calotype process, it has the singular virtue of producing a negative on glass rather than paper. Archer had combined the sharpness of the daguerreotype with the reproducibility of the calotype. This process, despite its va...

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