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>> allen positions a model in front of his camera obscura and faces to it the sun. >> the whole setup has to be calculated very, very carefully 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.

Very ancient technology. there is no doubt that this technology was available in the late 13th and early 14th century, exactly when it would have been needed to make something like the shroud of turin. >> allen positions a model in front of his camera and faces it to the sun. >> the whole setup has to be calculated very, very carefully 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 s...

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

Front of his camera obscura and faces to it the sun. >> the whole setup has to be calculated very, very carefully 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 injure...

>> allen positions a model in front of his camera obscura and faces to it the sun. >> the whole setup has to be calculated very, very carefully 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. >> af...