sharpie stays beautifully, untill you wash it.
it wont smudge, it wont sweat off, it wont fade... until you take a shower.
then all the abuse it took from your sweat and clothing catches up and it comes right off, leaving a barely existant ghost.
this, of course only applies to showers or actual attempts to clean yourself involving soap and scrubbing, water just running over your skin won't budge it - it's when you slough off the dead skin cells that it goes away.
sharpie, imhexperience, doesnt harm you in small quantities, but the chemicals cant be good for you when *all* over your body.... kinda like deoderant/anti-persperant under the arms doesnt hurt anyone, but some deoderant freak was on the news for covering his body in it and dying b/c his skin couldn't breathe or sweat. and the negligable levels of toxins that are in things that qualify as "non-toxic" are only negligable for "normal" or 'reasonable" use.... like, if you slip and get some ink on your fingers while working with sharpie, it wont kill you, but it might be toxic when absorped through your *entire* skin.
henna's less toxic but more of a pain..... i personally would use sharpie, just not, like, paving my entire body in it.
breathe deep seek peace
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