For a full huge overdone maaracha on the color and the shitah of rashi and why rashi does not write ???? see Kuntreis Chosem Shel zahav ‘??? ??. He also brings over 15 rishonim who hold clearly it is blue (many of them who always will quote shitas rashi if they argue yet none of them do). the kuntreis can easily be found with a quick search.
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