So I assume there are 8 colors? (black is mentioned and 7 from rainbow)
I have a hunch that this is not the case. Firstly, I think we have "teams" based on color. Twelve players, so if teams are 4 players there are 3 colors, 3 players there are 4 colors, 2 players there are 6. I tend to think the teams are of the same size or else one would probably have an advantage.
It's possible there is no "black" team. It seems weird to be randomly selected to die at the end of the game. So this leads me to a few possible ideas:
1) Maybe lynching turns people black. Maybe also some people have a "kill shot" that drains the color or something.. so if you get targeted you turn black. It says that after four days, if you're colored black, then you die. So I imagine there has to be a way for people to turn black, so at the very least I imagine that's what lynching does.
I guess if you can turn people black, you might be able to "paint" them, and convert them to your "team". So maybe if you're black you're still around but you have no ties to your previous color, but someone can paint you. Or maybe anyone can be painted, not just black players.
2) The above idea may not hold, because the universal QT does say "This QT doesn't close, but you can't talk in it after you have died." That could be standard protocol, or it could mean dying works as normal (you get lynched you die), and painting black is a different kind of special ability?
3) Color changing could be something random and not caused by particular day/night actions from players, or some combination of both.
Mod: Can you clarify "Black-aligned players will die the following day."? Is "following" meaning at the end of the game, after 4 days and 4 nights? Or following each night?