Amnesty International Portugal : Letter from a Prisoner

To highlight the human rights violations that take place in prisons, Amnesty International Portugal used text written in real lemon juice in a direct mail campaign - a method prisoners sometimes use to communicate with the outside world. The mailing, by McCann Erickson Lisbon, arrived as an apparently blank sheet of paper but with a message to iron the paper. The hidden message revealed a letter highlighting the problems and directing readers to the Amnesty website. The agency says donations have increased by 35% following the campaign.

Amnesty International Portugal : Letter from a Prisoner

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