If you are of a ~certain age~, you probably remember Hypercolor. Hypercolor It was a super cool clothing line all the teens wore that changed color based on your body temperature and the temperature of the air. Smithsonian Smithsonian TOO COOL AM I RIGHT? Well. Now there's a hair dye that is heat-activated just like Hypercolor. Tap to play or pause GIF Tap to play or pause GIF vimeo.com The semipermanent hair dye, called Fire, was created by Lauren Bowker at the London-based product development firm The Unseen. It changes color depending on the environmental temperature and the wearer’s own body temp. Tap to play or pause GIF Tap to play or pause GIF vimeo.com One version of Fire changes from black to red when it's hot. vimeo.com Other versions change from black to white, from silver to powder blue, from blue to white, and from black to yellow. Tap to play or pause GIF Tap to play or pause GIF vimeo.com Fire uses the same thermochromic ink used in Hypercolor shirts, but made safe to be used on the skin and hair. The product even changes color if you blush. Unfortch, Fire isn't quite out on the market just yet. Unseen hopes to have it out on the shelves by the end of 2017. vimeo.com Fingers crossed!