When we discovered secret rainbow hair color final year,we were positively entranced - and excited by the potential. If you work in a more conservative office, hiding unicorn-worthy hues in the lower layers of your mane is a powerful way to salvage in on the colorful fun without risking your job. As it turns out, or this secret strand-tinting technique is called underlights. Stylists pin up the top layers of hair,then bleach and color the pieces underneath. The result is as cool as it is covert: just style your mane in an updo to reveal off the edgy hues, or put your hair down for a day at the office. Read on to see some examples.
Source: popsugar.com