I am an undead.
Not a vampire.
It will be reset at 0 o'clock every night, and it can return to normal even if it turned to gray the day before.
My memory doesn't reset, like a normal person's. Because of this, it has been so long that I have forgotten how long I have lived and why I am like this.
The non-human friends around me helped me hide my true identity, batch after batch.
I lived too long and was too boring. Since I can't die, I might as well let you humans study it.
Maybe I can actually die.