Easiest Dollar to Counterfeit and 6 Ways of Spotting Counterfeit Money

2. Security Thread

A security thread on a dollar bill can be seen when held up to the light, just like a watermark. However, to fully utilize this security feature, you’ll need a source of UV (ultraviolet) or black light. Nowadays, these devices are cheap and easily found. Once placed under UV light, a security thread will change color, depending on the denomination of the bill ($5 – Blue, located on the right side, $10 – Orange, located on the right side, $20 – Green, located on the far left hand side, $50 – Yellow, located around the middle, $100 – Pink, located on the left side).Security Ribbon