THIS RE-WRITABLE PAPER CAN BE USED FORTY TIMES.

Scientists have developed a low-cost, environmentally friendly way to create printed materials with re-writable paper that can reduce paper wastage.
Even in the present digital age, the world still relies on paper and ink, most of which ends up in landfills or recycling centres.
Researchers Ting Wang, Dairong Chen and colleagues from Shandong University in China made the new material by mixing low-toxicity tungsten oxide and polyvinyl pyrrolidone, a common polymer used in medicines and food.
To 'print' on it, they exposed the material to ultra-violet light for thirty seconds, and it changed from white to a deep blue. To make pictures or words, a stencil can be used so that only the exposed parts turn blue. To erase them, the material can be put in ambient conditions for a day or two. 
To speed up the erasing, the researchers added heat to make the colour disappear in thirty minutes. Alternatively, adding a small amount of polyacrylonitrile to the material can make the designs last for up to ten days.
Tests showed that the material can be printed on and erased forty times before the quality started to decline. More paper is now recovered for cycling than almost all other materials combined, researchers said. The new material saves energy, water, landfill space and greenhouse gas emissions.
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