When we first caught wind of hair color trends like "opal" and "oil slick," as fun as they were, it was easy to dismiss them as passing fads. That was the summer of 2015, and almost exactly a year later, I sat in a salon chair as a stylist dyed my dark-brown hair pink. That truth alone might illustrate just how confounding the longevity of the pastel hair trend has been, not least to industry insiders. (You can keep telling us that it's "so over," French hairstylists, but our Instagram feeds—and the Versace catwalk—tell a different story.)
