1996 - The US issues a newly redesigned $100 bill on this day. The bill was again redone in 2013, adding a 3-D Security Ribbon and also a color-shifting bell in the inkwell. Are you still not sure if the bill is real? Try using a counterfeit detector pen. The counterfeit detector pen contains an iodine solution that reacts with the starch in wood-based paper to create a black stain. When the solution is applied to the fiber-based paper used in real bills, no discoloration occurs.