New "Spy-like" Disappearing Ink
Source: Dailytech
The process requires the works — a special printer and a special type of paper — but the results are intriguing. After 16 to 24 hours the “ink,” once printed clearly on the page fades. This could have numerous uses such as being used for memos, restaurant menus, and much more. After the “ink” fades, the paper can be reused.
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