The bulk update request #10069 is pending approval.

create implication black_highlights (1265) -> black_hair (246076)
create implication blonde_highlights (1631) -> blonde_hair (234497)
create implication blue_highlights (4262) -> blue_hair (179385)
create implication brown_highlights (411) -> brown_hair (245667)
create implication green_highlights (2610) -> green_hair (74147)
create implication grey_highlights (480) -> grey_hair (67718)
create implication orange_highlights (609) -> orange_hair (59220)
create implication pink_highlights (2947) -> pink_hair (124826)
create implication purple_highlights (3023) -> purple_hair (126298)
create implication red_highlights (4046) -> red_hair (149420)
create implication tan_highlights (116) -> tan_hair (8773)
create implication teal_highlights (273) -> teal_hair (2842)
create implication white_highlights (1845) -> white_hair (196525)
create implication multicolored_highlights (205) -> multicolored_hair (136847)
create implication rainbow_highlights (60) -> rainbow_hair (21275)

Reason: First attempt at a BUR so hopefully I'm not butchering this.

I think it makes sense that if a character has highlights of a certain colour, then it should also implicate that hair colour as well. If a character has a red highlight in their hair, then they have hair which is red, which should warrant the red_hair tag as well as the red_highlight tag. The only way I could see this potentially getting messy is if you're distinguishing between primary hair colours, but I can't see any situations where it wouldn't be helpful in either excluding or including anything relevant.

Also, I'm not sure if that list is exhaustive, I just pulled all the tags attached to the highlights_(coloring) page.