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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...

Injure, you will notice a discoloration on the linen. that discoloration would be a negative image of what was outside the camera. >> the silver sulfate would have been washed out of the cloth to complete the process using a chemical in plentiful supply. >> to remove silver sulfate from a piece of linen, one can use urine since urine contains levels of ammonia. whoever made the shroud of turin didn't do this on their first attempt. this probably took a lot of organizing, a lot of planning and a lot of trial and error before they got it right. >> when the image is analyzed, allen's method is sh...

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, you will notice a discoloration on the linen. that discoloration would be a negative image of what was outside the camera. >> the silver sulfate would have been washed out of the cloth to complete the process using a chemical in plentiful supply. >> to ...

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

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, you will notice a discoloration on the linen. that discoloration would be a negative image of what was outside the camera. >> the silver sulfate would have