This hair dye changes colour according to your surroundings

Sounds like something out of Harry Potter, but it's real...

Hair dye
Alain SchroederGetty Images

This may sound like a very early April Fool's, but someone has invented a hair dye that changes colour according to your surroundings. Remember the magic of mood rings? Yeah, like that, but on your hair...

The remarkable dye, dubbed 'Fire', changes in colour from bright red to black, according to the temperature around you, the Metro reports.

So, if you're freezing at the bus stop you'll be raven-haired, but a fiery redhead while feeling toasty on the sofa...

There's also a pastel shade for the REALLY adventurous out there.

Created by The Unseen, the dye is making its debut during Fashion Month, and works not by Harry Potter-style magic but old fashioned chemistry: it uses ink that reacts to temperature.

'Above a certain temperature, one of the molecule forms is more stable than the other, and so a reaction takes place producing a molecule with a slightly different absorption of light, and thus a different colour,' Lauren Bowker, founder of The Unseen, told Forbes.


Hmm, we don't even want to imagine what happens when you start sweating up a storm at the gym!

Then again, maybe we shouldn't be surprised – after all, someone dyed hair with Nutella recently...

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