tainted character question

[Sandu Ciorbă]

what happens if i use a ckracked key/red key as a tainted character in home where u usually unlock tainted characters? idk why but i had this feeling for a while that if u try to use a cracked key in home while playing a tainted character you will unlock an achievement, maybe i read it somewhere, maybe its just my imagination. can somebody tell me if something gonna happen please

[Kenny]

If you have a tainted character and are playing as either version of them the red closet will have Inner Child if unlocked(Greed mode as Jacob and Esau), or if not it will just have a shopkeeper.