More than nearly any other fast-moving consumer goods (FMCG) sector, the beauty industry is guided by trends. And over the last few years, multiple trends have emerged with the promise that they will redefine the future of beauty. From balayage to activated charcoal, it seems like the next big thing can come from just about anywhere. And while that’s more true than ever, how are you supposed to know when something really is a thing, and when it’s just a flash in the pan?