"I dye it different things depending what I want. Pretty dresses would be a bit much. It could be grey when, uh, I am transformed."

"It wouldn't usually be a dress for boys anyway."

"Why don't you just pick something, I'm a little confused and I do not think we have the relevant - genre of reference material."

She tilts her head and considers him and says, "Okay."

And then there is a sort of indescribable presence, and he very clearly has a choice: to take power, or refuse it.

Yeah he's in.

There is a sensation of being filled to overflowing with magic, and there is an obvious mental action he can take to turn it on.

...and if he turns it on?

There is a brief flash of light, and his hair is a shining silver and he is wearing an attractively-tailored outfit based on a centuries-out-of-date military uniform. There is also another mental action he can take.

...he tries that one. Now his hair is brown. Now Edie's hair is red - now back to normal -

"Huh," she says, fingering her briefly-scarlet locks. "Pretty."

...giggle.

"Red hair is considered really attractive by a lot of people where I'm from!"

"I knew a girl with a pretty shade of pink." 

"Pink hair doesn't happen naturally in humans but it does sound very pretty. Is she okay?"

"Yeah."

"I'm glad. Anyway, I'm not sure how much that spell helps..."

"It is not super helpful. I can disguise reds so they can blend in, I guess, but that'll cause mass hysteria and they wouldn't have IDs, they'd get found out..."

"Might be useful for transit, but not in the long term, no."

" - we could lie flagrantly about how it works and claim it does more than that but we might get caught."

"More than that?"

"Like, if it changed enough things they might not be reds anymore."

"...Mm. What things would it have to change--if there was some effect to aim at, we could, oh, empower reds until one got it--"

" - if we do that everyone will panic. Like, launch-missiles-at-us panic. And people have to buy into it for it to work - and I have no idea what it'd have to change, it's not real in the first place..."

"We don't have to tell people we're doing it."

"And I can deflect missiles."