Sustainable hair dye made from blackcurrant waste

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The global hair dye industry is worth around USD 10 billion a year. More than 5,000 ingredients are used to make hair dyes, and studies show that some of these may promote cancer or cause allergic reactions. Moreover around 95 percent of all dyes end up washed down the drain. These substances eventually end up in rivers and streams, where they may pose an environmental hazard. Now, two researchers at the University of Leeds have created a natural, sustainable hair dye made from blackcurrant skins. Colour chemist Dr Richard Blackburn and organic chemist Professor Chris Rayner developed a new technology…

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