Why Don't Tattoos Fade as Skin Regenerates?

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Depending on the source you consult, anywhere from 14 to 23 percent of American adults and about 24% of British adults have at least one tattoo, a figure that one would think is set to rise considering the rather permanent nature of tattoos, ever increasing life spans, and that the tattoo is steadily becoming more socially acceptable.

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Sources:

http://health.howstuffworks.com/skin-...
http://www.nytimes.com/2013/04/18/fas...
http://www.webmd.com/beauty/wrinkles/...
http://www.ultimatetattoofinder.com/D...
http://www.tattooflash.info/Tattoo-FA...
http://onmilwaukee.com/living/article...
http://en.wikipedia.org/wiki/Tattoo_m...
http://health.howstuffworks.com/skin-...
http://health.howstuffworks.com/skin-...
http://en.wikipedia.org/wiki/Tattoo
http://health.howstuffworks.com/skin-...
http://en.wikipedia.org/wiki/Dermis
http://en.wikipedia.org/wiki/Reticula...
http://archives.evergreen.edu/webpage...
http://en.wikipedia.org/wiki/Skin
http://en.wikipedia.org/wiki/Epidermi...