Question :
How do you determine if a scratch was caused in the lab or in the camera.
 
Answer :
To process rolls of film, we splice together individual customer rolls for developing on our film processor. One hundred customer rolls are spliced together to make a master roll. Our processor runs at 37 feet per minute. It takes about 8 seconds to process the five feet of film that make up a 36 exposure roll of film. When we notice scratches on a roll of film, we examine the rolls immediately before and after it on the master roll. If they have scratches, then the scratch is a processor scratch. If the scratch is only on that single roll, it is a camera scratch.

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