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Natural Remaining Pigment
Hair passes through the same stages whether the lifting process is chemical or caused by the sun. Remember that the stages of lightening apply to natural, not color-treated hair.
Once the natural melanin has
been lifted from the hair, the NRP
is exposed and it will contribute tothe end color result.
NRP is the tonal value that the hair contributes as it lightens. You must determine the NRP that the hair will contribute at the desired level prior to coloring the hair. Then you can decide whether you want to enhance or neutralize the NRP.