From Bordeaux red to golden honey blonde. Rihanna debuted waist-skimming lengths colored a slightly muted molten gold, and similar shades have been spotted on Kim Kardashian and Keke Palmer.

That's the Revlon One-Step Volumiser, and it is so popular that it has racked up millions of videos on TikTok, with many comparing it to the pricey Dyson AirWrap. As a Fashion and Beauty Writer ...