July 1-3- The Battle of Gettysburg, Pennsylvania. The bloodiest battle of the Civil War dashes Robert E. Lee's hopes for a successful invasion of the North. July 4- Vicksburg, Mississippi, surrenders to the Union Army under Grant.
Method. 1  Test the pen to make sure it can tell the difference between good money and computer paper. 2  Apply spray starch to the next dollar bill in an attempt to make it read as fake. 3  After drying, test the results by re-applying the counterfeit money detector pen to both the dollar and to the computer paper.
The Secret Service offers the below methods to detect counterfeit bills: 1  Hold a bill up to a light and look for a holograph of the face image on the bill. Both images should match. 2  Looking at the bill through a light will also reveal a thin vertical strip containing text that spells out the billâs denomination.