Some pretty neat info about a certain new door : r/bindingofisaac
isaac-racing-mods/items.xml at master · Zamiell/isaac-racing-mods · GitHub
The Binding Of Isaac: Rebirth - The Polaroid and The Negative AT ONCE - Quick Tricks Ep. 2 - YouTube
The 10 Best Trinkets in "The Binding of Isaac: Rebirth" - LevelSkip
Steam Workshop::the polaroid (and the negative) but awesome
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 :