Colorsmith, first launched in the US in June 2020, has debuted in the UK, offering men a custom, personalized at-home hair color experience.   Colorsmith's made-to-order men's hair color is individually crafted by professional licensed colorists at the brand's London headquarters and is never premixed or premade. Every order comes with custom color, personalized, easy-to-follow instructions, coloring tools and access to colorists who can help at every step.   Colorsmith's Gre...