Why does fake tan turn green and is it safe to use when it does?

No really, why DOES fake tan turn green? We solve the mystery once and for all

Clear pink skincare bottle held up against pink background
(Image credit: Mykola Sosiukin / EyeEm via Getty Images)

Ever wondered to yourself, why does fake tan turn green? And, is it safe to use it when it does change color? You're in the right place.

Many of us love to add a warming, sun-kissed glow during the winter months if our skin feels a bit on the dull side in a bid to boost our mood or confidence levels. But if you're a regular self tanner, you've probably noticed this unusual phenomenon at some point over the years. 

Thankfully, we've sought some expert answers so you can wonder no more. Keep reading for why fake tan turns green, and whether it's safe to use if it does so.

skincare pipette and liquid on pink background

(Image credit: Vera Livchak via Getty Images)

Why does fake tan turn green? Is it safe to use? 

Turns out if your fake tan has gone green, it's not a one-off phenomenon. "That isn't your eyes playing tricks on you; this can happen if the fake tan is out of date or isn't stored properly," explains Delilah Kealy Roberts at Tanologist. "The bronze guide color is made up of three colors – red, yellow and blue – and when the red colour oxidizes, blue and yellow are left together to make green.

"The only thing turning green is the bronzer, which is a temporary color, but we don't recommend using if it's green," she adds. "Fake tan reacts with the amino acids in the dead layer of your skin to turn you a temporary bronzed color. If the tan is exposed to oxygen or too much heat, the guide color can turn green."

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Unless green is the look you're going for, the best thing to do is bin the bottle and replace with a fresh one. To prevent your fake tan from going green in future, keep it in a cool, dry place away from sunlight.

Lesson learnt!