Rainbow hair has been around for a while, and as we've discovered, it's not just for kids. But if going the whole hog and committing fully to multicoloured hair is just a tad too bold for you, maybe this latest trend is just what you've been looking for. 

#hiddenrainbowhair has been trending on Instagram after London salon Not Another Salon posted up these pics of hidden rainbow hair so perfectly bright, they look like they've come straight from an Instagram filter. 

Stay tuned for the final results later today :) #rainbowhair #hiddenrainbow #hiddenrainbowhair by Seniour colourist Carla

A photo posted by Not Another Salon (@notanothersalon) on


The premise is simple; have your amazing rainbow striped coloured hair underneath, ready to show off with a handy half top-knot hairstyle, but easily conceal it for important work meetings by simply letting the top half of your hair down. Sound easy? Well it is, the only thing that's tricky to get right about the trend is neat, brightly coloured rainbow colours on your hair. Which is why these pictures posted of the process by Not Another Salon have inspired people on Instagram with the saturated vibrancy of the dyes.
 

Hidden rainbows are all the London rage right now. #hiddenrainbowhair #hiddenrainbow #rainbow #rainbowhair by Carla

A photo posted by Not Another Salon (@notanothersalon) on


The top half of the model’s hair was sectioned off and pinned up, leaving the bottom half to be split into seven painted sections. The results are really amazing, but be warned: rainbow hair fades fast. Another great result of rainbow hair is that tucking it beneath your natural colour is a smart way to try a more low-maintenance take on the trend, as the hair that lies over the top will protect the bold colour for longer from the elements. Giving you bright, vibrant colour for longer.

Here are some other examples of the trend displayed on Instagram:
 

Se viene Un #secretrainbow !������ por @nico_lacone

A photo posted by ��Belén Flores Núñez�� (@velenporella) on