DNB is giving an online education system for retail personnel providing payment services on behalf of a financial institution. The e-learning teaches them ways to detect banknotes that are counterfeits or unfit for circulation. Microprinting: Microprinting is a stability function which is employed on US dollar banknotes to prevent counterfeiters. https://socialdosa.com/story9217983/not-known-factual-statements-about-copyright-50-usd-bills