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Stretchy plastics hide secret pictures

from New Scientist

Squeezing or stretching the plastic reveals a hidden image: In these cases, the sun and a rabbit. It could be the ultimate stress ball for spies. An invisible ink creates secret messages on bendy plastic that are only revealed when you give it a squeeze. Previously, Jianping Ge of the East China Normal University in Shanghai, China, and his colleagues created invisible inks that appear when submerged underwater or exposed to a magnetic field. Now they've made an ink you can reveal just by squeezing with your hand. more


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