Help with grey coverage

Im currently studying hair at college and we use Koleston Perfect me+, i regularly do my own roots but ive noticed the greys are no longer covering. Ive mixed in a pure natural shade as advised by wella and used 6% but they end up looking translucent. Can anyone reccomend a different brand that has better grey coverage? Ive asked at college but they only use wella. TIA


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What shade are you using? And what percentage of white are you?


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