So, I stupidly did not get my highlights done since September, and now obviously salons are shut. I don't have bleach highlights, I have high lift highlights, and they are a lovely caramel colour. My natural colour is dark brown, and I have more and more greys creeping in. I am considering tomorrow buying a chestnut box dye and dying over the caramel and the greys, will this work over high lift and is it a good idea?