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The Childhood Eye Cancer Trust has launched posters that react the same way to flash photography as a cancerous eye. Wunderman created the ads, which show an image of a child’s eye. However, the pupil has been coated with an ink that reacts to camera flashes and turns white, mirroring how a cancerous eye reacts to photography. The posters, which feature images of children who have survived retinoblastoma (eye cancer), will appear in GP surgeries, baby clinics and childcare centres.