Race numbers

Does anyone know what the stuff is, that the ironman people use for race numbers on the body? Is it ink? thanks for any information.

I think that Kona uses number “stamps”, and a regular old ink pad like you would find at a stationary store. AFAIK, all of the other races use the standard “magic markers” from the good ol’ department store.

http://www.ankylosaur.com/images/sharpiemagnum.jpg
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I love that hugh sharpie!!! I guess I need someone in America to ship one to me. I guess those places like office max has them?? Our races still rely on the old fashion way of timing. we are having problems with numbers washing off, or seen clearly.