High lift hair colour naturally will always turn yellow or orange with time, even if your stylist has lifted your hair to white from the start, in a lot of cases it’s advise to use a toner or toning shampoo to maintain a clean blonde colour, this contains violet or blue tones to mask the yellow or orange tone, but this also will wash out with time, as the molecule in this pigment are very tiny and it’s difficult for your hair to hold on to them , this can be improved by using a good quality shampoo and conditioner and regular treatments this is good advise to maintain any colour service