tag implication #9267 two-sided_hair -> multicolored_hair has been rejected.
Reason: The two sides are generally distinguished by strongly contrasting colors, so more than one color is always present. Theoretically artists could achieve the same effect with two different shades of the same color, but I have not seen a single case of this. I assume black and white are considered colors for this purpose.
I considered implying two-tone_hair instead but ruled it out because there are a few cases where additional streaks or more complex coloration is present, e.g. https://www.pixiv.net/member_illust.php?mode=medium&illust_id=73052552
EDIT: This tag implication is pending automatic rejection in 5 days.
EDIT: This tag implication has been rejected because it was not approved within 60 days.
EDIT: The tag implication two-sided_hair -> multicolored_hair (forum #158456) has been rejected by @DanbooruBot.
Updated by DanbooruBot