The Coin Detective
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A (mostly) non-technical introduction to IOTA’s mana

By blog.iota.org on May 31, 2021


The National Physical Laboratory of IndiaFor India’s third national election in 1962, the National Physical Laboratory of India developed a proprietary violet ink formulated from silver nitrate, a light-sensitive compound common in photographic chemicals. Once a voter’s finger has been painted with this ink, any exposure to UV

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Related coins: IOTA