There are many things inside, including film negatives.
Mitchell carefully stored the film negatives away in the basement of his shop.
The original cast had been photographed, and new casts were created back from the film negatives.
These prices were similar to those of prints made from film negatives.
Digital images also lack the grain that is on film negatives.
He likely switched from glass plates to film negatives around 1915.
At first they analyzed film negatives to adjust exposures and color filters.
This was common for reproduction photography of flat copy when large film negatives were used (see Process camera).
Some magazines, with their glossy, color pages, still ask for film negatives.
When film negatives are used, one image will appear in the shadows of another image.