The Binding of Isaac: Afterbirth † - Binding of Isaac: Rebirth Wiki
The 10 Best Trinkets in "The Binding of Isaac: Rebirth" - LevelSkip
Faded Polaroid - Binding of Isaac: Rebirth Wiki
Floors - The Binding of Isaac: Rebirth Wiki Guide - IGN
Permanent Items - The Binding of Isaac: Rebirth Wiki Guide - IGN
The Binding Of Isaac: Rebirth - The Polaroid and The Negative AT ONCE - Quick Tricks Ep. 2 - YouTube
The Best Binding of Isaac Seeds (Repentance and Afterbirth+) | Blog of Games
Apparently gulping the faded Polaroid makes it unable to open the door in depths which I guess makes sense since you can't put it in the door if you swallowed it :
The Binding Of Isaac: Rebirth - The Polaroid and The Negative AT ONCE - Quick Tricks Ep. 2 - YouTube