The Federal Reserve will begin circulating a new $100 bill on Tuesday with some modern and colorful anti-counterfeiting features, after overcoming problems that postponed its debut for more than two and a half years. In addition to traditional safeguards like a paper blend that would be difficult to duplicate, the redesigned note will have two new features: a three-dimensional blue strip with images that appear to move when the note is tilted, and an image of a copper inkwell containing a holographic bell whose color changes when tilted. The note is the last United States currency denomination to undergo the “New ... (full story)