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I read a few posts here about medieval photographs 600 years old. Except that there only seems to be one photo made during those 500 or 600 years. In contrast, I as an individual, have probably made 500-600 photos in 2 or 3 years.
So, I have a few initial problems with this theory;
I read a few posts here about medieval photographs 600 years old. Except that there only seems to be one photo made during those 500 or 600 years. In contrast, I as an individual, have probably made 500-600 photos in 2 or 3 years.
So, I have a few initial problems with this theory;
- Why does only one photo exist for the whole 500 or 600 years to the early modern period.
- How did this one photo fix an image for 600 years.
san jack photography:Black and white photographic films using silver halide emulsions are the only film types that have proven to last for archival storage. The determining factors for longevity include the film base type, proper processing (develop, stop, fix and wash) and proper storage. Early films were coated onto a nitrate base material which was prone to combustion if stored in uncontrolled temperatures, Nitrate was replaced with acetate-base films. The acetate films have now been discovered to outgass acids (also referred to as vinegar syndrome). Acetate films were replaced in the early 1980s by polyester film base materials which have been determined to be more stable that nitrate and acetate base films.
What Is Archival Quality?
Archival quality simply means that it will have a suitably long life if stored or displayed correctly. Archival materials and processes are laboratory tested to not contain anything that will cause the print to deteriorate of its own accord. There are several standards for archival status. The most commonly known standard is the ‘acid free’ classification, but in photography there are even more considerations such as the fade resistance of the dyes in photographic paper and proper calibration of the chemical baths. Most professional papers are now certified for 100 years of ‘normal’ residential display before any noticeable fading. Consumer prints (drugstores, department stores, photo-mats, etc.) are not archival as they are only certified for around 20 years and usually have an actual life span much lower than that.
- When making a photograph the light sources create highlights and shadows on the subject. The shadows in photographic prints are ‘flat’ black areas as these are areas where no light is being reflected back to the film.
But in the shroud image this is not the case. There are shadows but they contain all the information of the form in shadow, in other words the shadows on the shroud are not ‘flat’ as they should be if they were photographic.