43+ Hidden Rainbow Color Hair Images. Hidden rainbow hair is the new trend. Women show off their mesmerising hidden 'secret rainbow' hair colour on social media thousands have shared their secret pastel and rainbow hair colours online the technique involves hiding bright colours under the top layer of hair
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Rainbow hair is a fun look, but it does require a lot of commitment. Leave it on for 30 minutes: The look was shared by not another salon on instagram just a couple of days ago with the caption hidden rainbows are all the london rage right now. While we're not necessarily going to join in with the trend, it's still nice to take a look at some of the most creative colour out there, including this amazing 'hidden rainbow' effect from london.