I'm late about this one, but i honestly have only heard of bay dun, dun (or lineback dun, both the same darn thing to me, lol), and red dun. Great to learn there are more names you can get confused on, lol. And, btw, A True Rolex is my most FAVORITE stud EVER!!!! I love him to death and he will be something I will look at in the future if my mare proves herself!!!