A fairy's color doesn't refer necessarily to their appearance or race.  A fairy's color refers to the color of their magic, which is why you don't get in-betweens or mixtures, even though marriage between fairies of different colors is very common.  Purple fairies are the only ones who are particularly snooty about marrying the same magic color, and that's just because they're snooty about most things.  Virtually all purple fairy families are royalty or high nobility in the various fairy kingdoms.



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