ANYONE who colours their hair will know that maintaining a look is not cheap – especially when you go for bolder shades.

Once you’ve paid your hairdresser for your dye job it can often seem far too painful to fork out for expensive hair products salons offer on top.

But this video might just make you think twice about scrimping when it comes to shampoo.

Beauty salon owner Rachel Trach uploaded a video to Facebook in the hope of showing what using a cheaper shampoo can do to coloured hair.

Rachel filmed herself carrying out an experiment with a salon shampoo and a drugstore version and the clip has now been viewed over five million times.

For her experiment Rachel tested Unite 7 Seconds Shampoo, £19.95, and what looks to be Tresemmé's 24 Hour Body Shampoo, which is £5.24 for 900ml at Boots.

After pouring each shampoo into separate glasses of water Rachel then adds a lock of brightly coloured hair.

When she added the hair to the glass with the Unite shampoo the water didn't really change colour.

But when it was added to the Tresemmé option, the dye seems to be immediately stripped from the hair and the water turns bright purple.

It is worth noting that the Tresemmé product, if it is the 24 Hour Body shampoo, is not specifically targeted at coloured hair.

It also seemed to be a clear shampoo – which tend to be clarifying and not recommended for those with dyed hair.

Meanwhile, shampoos that are colour-safe tend to be creamier in colour.

It is also important to note that it is unclear when the strand of hair being tested was dyed – or what dye was used.

A spokesperson from Unilever told The Sun Online: "The product featured in the video promises to increase volume and lift – it is not formulated to lock in colour.

"For coloured hair, we recommend using a different product from the range which is designed for colour treated hair and keeps hair colour vibrant for up to eight weeks."

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