Link: https://www.theguardian.com/science/2019/sep/25/scientists-invent-new-technology-to-print-invisible-messages
Summary: Scientists have invented a new technology that enables them to see invisible messages. The approach, developed by researchers in China, involves using water to print messages on paper coated with manganese-containing chemicals. The message, invisible to the naked eye, can be read by shining UV light on the paper.
Summary: Scientists have invented a new technology that enables them to see invisible messages. The approach, developed by researchers in China, involves using water to print messages on paper coated with manganese-containing chemicals. The message, invisible to the naked eye, can be read by shining UV light on the paper.
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