The Unseen have invented a new hair dye called Fire.

The dye is similar to the stuff that makes mood rings change color, but it's safe for use on skin and hair.

It launched at London Fashion Week, and comes in a variety of colors from bright to pastel.

The dye is semi-permanent, lasting over a few washes. But the cool part is that it reacts to the temperature of the wearer and the environment around them, causing the dye to change dramatically.

Unfortunately, they are still looking for a commercial partner to get this product for sale.

But until then, you can just obsess over the videos they've been uploading of this magical dye on their Instagram and website.

We can't wait for Fire to hit the market! What colors will you choose?