Scanning electron microscope image of paper used to print the U.S.100 dollar bill. Notice the fibers in the paper. The bills also have a lenticular array,or micro-lens,which shows a different colour when the viewing angle of the bill is changed. This is just one of the security (anti-counterfeit) features of the United States 100 dollar bill,others include: micro-print,watermarks,lenticular images,special inks,fluorescent fibers and strips,coloured fibers,and the use of full coloured inks. Magnification is 250x when printed 10 cm wide |