[Muffet is concerned at Maka's sudden drop in mood, but doesn't comment on it.]

As far as I'm aware, yes. I admit it's not my field of study- running a bakery involves relatively little advanced metaphysical theory- but I've only heard of human souls ever coming in those seven colors. Not that the color of your soul is the only virtue you can have, of course, people are always going to be more complex than a single trait. It's more the one that's strongest in you, the one that guides you in life the most.