I wanted the Colorsonic to zap my grays. Instead, I got a lesson in tradeoffs. If you buy something from a Verge link, Vox Media may earn a commission. See our ethics statement. is a senior reporter ...

As hair care products and styling tools continually evolve, one aspect of the industry has more or less stayed the same — namely, the technology and application of box dyeing your hair. But L’Oréal is ...