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Before you can start the exposure. a medieval artist would need to ensure that any image projected on a sheet could be permanently fixed. the sheet would be soaked with photographic chemicals. today, this means using silver salts. both silver nitrate and silver sulfate have been around in europe from at least the 13th century. and it s very easy to make. a sheet is soaked in silver sulfate solution. dried. and then mounted in the camera. after eight hours expose injureyou will notice a ....