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Electoral ink, indelible ink, electoral stain or phosphoric ink is a semi-permanent ink or dye that is applied to the forefinger of voters during elections in order to prevent electoral fraud such as double voting. It is an effective method for countries where identification documents for citizens are not always standardised or institutionalised. One of the more common election ink compositions is based on silver nitrate, which can produce a stain lasting several weeks. It was first used during the 1962 Indian general election, in Mysore State, now the modern-day state of Karnataka.
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