Can I do that??
I have a box of Naturtint 10n. But I read on here that I will end up with brassy roots.
Could I use Jerome Russell 40vol 12% peroxide developer in place of the developer in the naturtint box?
I'm dark blonde/light brown with grey which is coming through completely white/colourless.
And I am wanting to home dye to save money.
Advice gratefully received 