UV Qualities: If you shine an ultraviolet light over a bill, the security thread will glow. Every denomination glows a distinct color. The thread is embedded in (not printed on) the paper and operates vertically through the clear field into the remaining on the Federal Reserve Seal. On genuine bills, https://how-can-i-use-uv-light-to88766.blogerus.com/60616961/how-copyright-pens-detect-copyright-an-overview