It is generally recognized not to colour the entire hair reach time it is coloured.
Results can include more intense colour where it is not wanted.
Here is a link on doing roots, http://www.typef.com/article/dye-roo...dye-rest-hair/ although the root touch up kits available have an "easy" comb to use, http://www.makeupalley.com/product/s...rol/Hair_Color
And here is something hairstylists can offer for adding colour contrast to darker shades of colour, http://www.lorealprofessionnel.com.a...runes2.aspx?tc=&
"- If you want a touch of colour, whilst preserving your natural tone, Maji.contrast lets the hairdresser place colour (on the ends, on a few meches, over the surface), without pre-lightening and never extending the colour to the roots, for an intense and lasting result thanks to its Hi.Chroma ™ content (ultra chromatic colourants)."
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