"In animals and humans, silver accumulates in the body over time. Chronic intake of silver products can result in an accumulation of silver or silver sulfide particles in the skin. As in photography (where silver is used due to its reactivity with light), these particles in the skin darken with exposure to sunlight, resulting in a blue or gray discoloration of the skin."
http://en.wikipedia.org/wiki/Argyria





a pripadne este toto:
http://itthing.com/the-real-smurfs-people-who-turned-blue-literally