Help with root touch up on dip dye hair :-)

Hi everyone,

Looking for some advice please 🙂

My hair is long and naturally almost black with the mid length to ends dip dyed a light brown/blonde colour. Unfortunately I have a fair amount of grey that comes through at the roots. More often than not I will go to the salon to get my roots done and to lighten up the dip dye part of my hair but due to being skint I sometimes touch up my roots at home.

In the past when I do my roots I cover the light parts of my hair in coconut oil so that when I rinse the black dye out it doesn't darken the light bits- but the light bits always end up a bit darker after I have washed the dye out.

I was wondering if there is anything else I can try to ensure the light bits of my hair don't darken when I touch up my roots?

Thanks 🙂