Lately, we've seen a crop of stars choose bold, colorful coifs that beauty bloggers have endearingly dubbed unicorn hair. But it wasn't always purple ombre and pink tips. In decades past, hair coloring was a lot more subtle…and taboo.
In the 1950s Gelb's brand appealed to the masses with Miss Clairol Hair Color Bath, which women could discreetly use every day. The punk and rock influences of the '90s popularized the coloring trend of highlights and is the origin of unicorn hair. Fast forward to the present and about 70 percent of woman use hair coloring product according to the Atlantic. The pastel movement seems to be in vogue today, and idols like Katy Perry and Emma Stone are only making these beauty products more appealing.