When you are turning the Film Ejection Crank to get your Instant photo, the chemicals will spread during the ejection of the photo. So it is important to turn the Film Ejection Crank smoothly (not too fast and not too slow). If you are turning it too slow and pause during the ejection, the chemical will stay where you stop and cause the white line in the photo.
My Instant Photo Has Some White Lines Over The Image!
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