With that said, If I had to write something important on myself or someone else, I would probably just stick with a Sharpie or other simple permanent marker. They work pretty well for writing on skin and have been used for that purpose for a longtime.
I'm not a medical person, but I'm with Paul, if I were to want to write something on someone, a Sharpie would probably be my first choice.
In fact, I keep one in my kit. Not exclusively for that purpose by any means, but I try to have a couple of different writing/marking devices that can work on a number of different materials and conditions.
For example, a Crayon, chalk, Sharpie, mechanical pencil and Space Pen.
In the dry, the chalk would be good for buildings/sidewalks. In the rain, the Crayon does better than chalk but is less visible. The Sharpie is good in a number of situations, but not so much in the wet.
-john
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