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Dying your hair reflects upon you and your personality, not the art. It allows you to better express yourself, but it doesn't change who you are. Any approval or disapproval you get as a result is coming from a personal level. The only thing any instructor should be concerned about is whether the dye is likely to leach onto equipment or other classmate's ...
I think the best thing to do is to ask your Master/Senior Instructor. This kind of thing can vary widely from school to school, but in most modern styles there is nothing disrespectful about having funky hair.
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