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The insane hack only requires some coloured tissues paper, which is placed in a bowl then poured over with boiling water.
This causes the colour in the paper to run, and soaking the hair in the water will see the it colour transfer over for amazing temporary mermaid hair.
The hack is taking off in Facebook groups over the country with more and more time-rich parents playing hairdresser on their kids.
One mum is childcare worker Sam Marley, from Plymouth, whose daughter Emileigh, 10, saw the tissue trick on YouTube and begged her mum to try it on her blonde hair.
"I was very worried it would damage her hair, as her hair is so beautiful and light blonde but I researched it a lot online and read a lot of reviews to make sure it was safe and everything seemed positive so thought it was worth a try," says Sam, 33.
"Emileigh chose the colour pink as she thought it would be really bright on her hair and look the best.
"The results were so much better than I thought it would be and the colour was so much more vibrant.
"She has had so many compliments and comments on it and now loads of her friend's parents have ordered the same paper to do their hair.
"Emileigh loves it and doesn't want it to wash out, she's already planned her next colour - purple - for when it's all washed out.
"It's definitely been a memorable part of lockdown that has cheered her up whilst being isolated."
Nursery assistant Sarah Etheridge, 43, also tried it out on her 16-year-old daughter Charli's locks with incredible results.
"It was really easy to do, I just put the coloured tissue papers into bowls and put boiling water in," says Sarah from Great Yarmouth.
"Whilst I waited for it cool down, I sectioned Charli's hair into ponytails then just laid each ponytail in the bowls.
"We dried her hair as usual and washed it this morning and some of the colours have kept in.
"I just used whatever tissue paper colours I had in my craft box and left the choice to my six year old Tommy who said we should use all of them.
"I think it looks pretty good, Tommy said it looks like a rainbow and Charli thought it was cool, better than she expected!"
Four-year-old Evie-Mae Plarkou wanted mermaid blue hair, so mum Maria, 25, set to work from their home in Nottingham.
"I was worried that it wouldn't work and Evie would be upset but luckily it worked first time!," she said.
"Evie chose blue because she loves Princess Elsa so that's her favourite colour.
"We are both very happy with how it turned out and we might try some more colours once this has completely faded!"
We'll definitely be trying this!
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