The paper contains hydrochromic dyes, which change colour when wet. The scientists found they could fill standard ink cartridges with water and use them, along with the rewriteable paper, in a normal desktop printer. Print is only visible for about 22 hours, or as long as it takes for the paper to dry completely.
Read more: http://bit.ly/1finSZw
Read more: http://bit.ly/1finSZw
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