When you put a new film cartridge into the Polaroid Camera , it will spit out a dark slide - the first piece of black / dark paper.
Use some masking tap or clear tape, tape this dark slide across the film ejecting mouth, forming a flap that dangles out.
The function of this flap is to shield all light ( especially UV) from hitting the film during the first 30- 60 seconds when the film is being ejected.
Alternatively you can give the Impossible a Frog Tongue.
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