Nicole Richie's Blonde Hair
A: Nichole's hair color is multi-tonal, with hair color levels ranging from 8 to 10. This means that you'll need to lift your natural color a minimum of 4 levels to get the desired results and will require some pre-lightening.
Make sure that your stylist performs both a strand test and a patch test to make sure that a) your hair can withstand the procedure and how much time will be needed to process to the color you want, and b) that you don't have any sensitivity to the chemicals used in the processes. This is definitely not the kind of color you want to attempt at home on your own, if only because it will require constant monitoring to ensure it is done safely.
As to the question of how often the color will need to be redone for maintenance purposes, you will have to get the color/lightening retouched every 6-8 weeks. Since the average person's hair grows at a rate of 1/2 inch per month, after 6 to 8 weeks, you will have approximately 1/2-1 inch of new hair growth (or more) with your natural hair color.
This means that the new growth will be very visible because of the dichotomy of the two colors. You can extend the time needed between retouches in color by creative styling methods, such as using staggered parting to keep the scalp area from showing so readily.
Even so, 10 weeks is likely the longest you will be able to go between retouches before your hair becomes obviously in need of re-coloring.
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See also:
Nicole Richie hairstyles
Hair coloring and hair damage
How long hair dye lasts
How to cut Nicole Richie's medium length bob
Nicole Richie's hair and face shape
