Scratch Test: Difference between revisions

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Prepare 50-100' of test film on a house reel. Project as normal, rewind, and repeat several times (50-100 is ideal, 10-15 may be more practical). Check for scratching on screen and/or on the bench when rewinding. Keep track of base and emulsion side so you can evaluate if anything shows up.  
Prepare 50-100' of test film on a house reel. Project as normal, rewind, and repeat several times (50-100 is ideal, 10-15 may be more practical). Check for scratching on screen and/or on the bench when rewinding. Keep track of base and emulsion side so you can evaluate if anything shows up.  


This method is most useful for evaluating vertical scratching cause by rollers and flywheels.  
This method is most useful for evaluating vertical scratching.


===Spot Check Method===
===Spot Check Method===
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