CARBON

CARBON process, The Print fading was a common occurrence in the earliest days of photography, and several people sought to address themselves to this problem. In the mid 1850s some began to experiment with carbon, and in 1864 Joseph Wilson Swan perfected the process, which he also patented. Prints made using this process came in any colour, and were permanent. The sensitising solution consisted of a mixture of carbon, gelatin, the colouring material, and potassium bichromate. …

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