NEW DELHI—These may be tough days for newspapers in the U.S. But in India, the old-school, ink-stained business is booming as more people from smaller cities join the middle class, boosting ...

For decades, India has used the ink, made primarily from silver nitrate, to mark voters after they have cast their ballot to prevent duplicate votes and fraud. When exposed to sunlight ...

When newly independent India held its first-ever general elections in 1951 and 1952, organizers turned to the idea of using indelible ink to mark voters, in efforts to ensure a fair ballot.