The following exerpt is from the aticle entitled 'RFID tattoos for tracking cows... and people' by Thomas Ricker
"Did you know that Saint Louis based Somark Innovations successfully tested an "RFID tattoo" on cows and rats? Yes indeed, tattoo, not the ol' RFID chip found in passports, dogs, and Dutch VIP clubbers. Somark's system uses an array of needles to inject a passive RFID ink which can be read through the hair on your choice of beast. The ink can be either invisible or colored but Somark is keeping mum as to its exact contents. They only say that it doesn't contain any metals and is 100% biocompatible and chemically inert. The tattoo can be applied in 5 to 10 seconds with no shaving involved and can be read from up to 4 feet away -- the bigger the tattoo, the more information stored."
The rest of the article can be found at:
http://www.engadget.com/2007/01/18/rfid-tattoos-for-tracking-cows-and-people/
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