I wouldn't suggest dying your hair purple and black before rush.
Everyone will be focusing on your hair, and not what's under it, YOU!.
Let's face it, it's a conversation starter or stopper.
While going through rush, with your normal hair, you will have the opportunity to meet more women. Maybe on day one, you talk to 3 girls, and THEY don't like purple and black hair, so they say you are boring, mean, or whatever, and get you released for a bogus reason. The rest of the sorority couldn't care less about your hair color, and would find you a great, cool member. Sadly, they'll never know, because they didn't have the opportunity to meet you. You will be giving yourself more opportunity to meet more girls.
Get your foot in the door, meet as many members as you can, be yourself, by the end of recruitment, you'll know which house would love YOU, purple hair and all, and where you are "at home".
Also, you will be with a lot of PNMs, who can be catty and immature, and recruitment is stressful enough, without this additional hassle. If you join the house that's right for you, and you still want to color it, then color it. Sure, there will always be some who won't like it, but you'll be with other great women who love you for you.
I just don't want 1-3 members that you initially meet, to get you released because THEY don't like purple hair. Also, there are older women who are advisors that if they heard "the purple and black hair girl" would freak, and they could sway some members votes. It does happen.
I speak from experience as a PNM, active, and advisor, and I hope it helps. I like purple! Good Luck!
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