'A synthetic rinse will show up green under fluorescent lights - that's why hairdressing salons do not have this type of lighting. 'You see it all the time in the House of Commons chamber if you know what you're looking for. Prime Minister Boris Johnson would like hair salons and barber shops to reopen ahead of schedule with PPE measures in place, it is claimed. However, his journalist sister Rachel Johnson has backed his claim that he does not use dye. P’haps they could do a similar style for you. 'Most blond men in their 50s are 60-70 per cent grey - myself included. she tweeted in 2016. It’s a much tidier look and I think it suits him. 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Dream Filter works in a way that it magnetises the minerals built up in the hair from the water, removing the pigmented minerals and returning the hair back to the colour it should be.' Tory leadership hopeful Boris, 55, … However if the hair is too yellow, the ash can cause the hair to go khaki as yellow and blue make green.' Mr Johnson (pictured out running in Oxfordshire last year) has had a dramatic makeover over the past year as he geared up for a bid to take over from Theresa MayMr Morris, who ran a chain of hairdressing salons before entering politics, said blond men in their 50 - including himself - were invariably going grey Mr Johnson has had a dramatic makeover over the past year as he geared up for a bid to take over from Theresa May.Sources close to Mr Johnson, pictured at hustings in Cardiff earlier this month, branded the claims 'nonsense'Mr Johnson's journalist sister Rachel (pictured at Wimbledon this weekend) has previously rejected the idea he uses dye, saying 'all Johnsons are natural blondes'Mr Johnson's father Stanley (pictured in London last month) had blond hair but it has gone white as he got olderThe former London mayor has lost weight, smartened up his suits and tamed his tousled locks to a certain extent.His girlfriend Carrie Symonds has been widely credited with the would-be PM's sharper image.In an interview with the Sunday Times magazine in 2016, Mr Johnson was quoted as saying of his hair: 'This is the real thing, it's all natural.'