Nanoparticle coating turns paper rewritable under uv and heat

Scientists have developed a special nanoparticle coating that's easy to apply to normal paper and changes colour when ultraviolet (UV) light shines on it. The colour change can be reversed when the coating is heated to 120 degrees Celsius (248 degrees Fahrenheit), and allows for up to 80 rewrites
👉 http://telegramscience.blogspot.ru/2017/02/scientists-have-found-crazy-new-way-to.html