How should I touch up my roots on lightened Bright Red hair?

[Nicola]

I've got naturally dark brown hair. I pre-lightened it to get it to a really bright red colour. But my roots are starting to grow out again. How should I go about dying them red again when the time comes?

I've seen a Live Colour XXL Red with prelightener in it especially for dark hair, if I put this on my roots first and then the rest of my hair, do you think this would work?

 

[da da]

Jus touch up the root will do.