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Hair dye that never grows out

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  You know that permanant hair dye grows out after a while, and you get those roots showing through? My idea is to invent a hair dye that not only penetrates the hair cuticle, but actually leaves a micro sac of dye fluid just underneath the skin, in the oil sac of the hair. This way, when the hair growss, the friction would burst the sac, causing the dye to be released and the hair would grow out of your head already coloured! The hair would only need to be dyed every 4 months.
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