"I really don't know what to call this, since it's apparently a new trend," (sic) she writes on YouTube.

"i want to call it 'TFW You Are Secretly Not A Muggle Hair', but i have no clue how to shorten that. others have called it 'hidden dyed hair', 'secret dyed hair', 'magical dyed hair', and i think someone called it 'peekaboo hair' once? i'm still sticking with my name, though. maybe i'll shorten it to 'Secretly A Wizard Hair'"

To create the look, Harkness says her hairdresser "gathered a bunch of my hair" and tied "the top in a circle-ish ponytail". They then "took the layer underneath that, and only dyed that part".

"There’s that layer of hair which was bleached and dyed, and there’s layers of hair underneath that which are my natural hair colour."

The look even works on longer looks. On Tumblr, she tells her followers: "When i had longer hair was dye a streak/part near the nape of my neck so that if i bunned it up a certain way, it couldn’t be seen at all!"

Get a 360 degree view of her hair in the video below.

New ‘hidden’ hair dye trend is perfect for the wary and cautious