Paper is such a common material in our daily life that we do not pay any attention to it, even though we use it continuously during the day. On average, 300 million tons of paper are used worldwide each year. Throughout history, it has been the instrument that allowed men to preserve the cultural heritage of humanity: the most famous literary works were written on paper, as well as artists’ drawings and scientists’ calculations that led to great discoveries. Until a few decades ago, it was the only medium we used to store our memory. In the past, for centuries, paper was made using mainly rags of linen, hemp and…