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[Game Of Thrones] If Jon had been born with certain different features, how would Ned have gone about concealing his true parentage?

Namely, silver hair and purple eyes. It would be a dead giveaway that he's Rhaegar's son. Would Jon have to dye his hair black all the time?
gpt
In the books, Ned had a crush on Arthur Dayne's sister Ashara who had "haunting violet eyes". She's one of the women people suspect as Jon's mother. If Jon had purple eyes Ned would probably have to say that Ashara was his mother, and people would buy it. And although Ashara herself had dark hair, some of the Daynes did have platinum blond or silver hair.