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See how a secret ink formula prevents voter fraud in Indian elections

Nearly a billion voters are heading to the polls in the ongoing Indian elections. Each voter is marked with a purple, indelible ink stain to indicate they've cast their vote. The mark has become synonymous with these elections and for decades only one company has supplied this special ink.

01:33 - Source: CNN
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india ink 50.jpg
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See how a secret ink formula prevents voter fraud in Indian elections
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