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Liquid tags.

Israeli company CrossID claims to have developed a form of liquid RFID radio tag, for marking and identifying anything from bank notes to clothing and groceries. The product is not yet in production, but the makers are hoping that it will only cost a fraction of existing smart tags. More here.

‘The system uses “nanometric” materials—tiny particles of chemicals with varying degrees of magnetism—that resonate when bombarded with electromagnetic waves from a reader. Each chemical emits its own distinct radio frequency, or “note,” that is picked up by the reader, and all the notes emitted by a specific mix of different chemicals are then interpreted as a binary number…CrossID has built a laboratory prototype reader and proved the concept. It is now in the process of raising $15 million in funding to create its first commercial products.’

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