"Pretty good," Ron replied, more relieved than impressed - although it did look about right, not that he had much of an eye for that sort of thing. "Couldn't call it pink, that's for sure. Well done." And he hadn't had to lift a finger, or let some stranger throw charms at him. If she was satisfied, he saw no reason to complain.
... That was no reason not to be a little sanctimonious, though. Just because he was very much off-duty didn't mean he couldn't fit in a little unwanted advice. "Still, you probably shouldn't go around stopping random people on the street and asking for hair colour. Not everyone's so obliging, you know."