They are referred to as safety threads. Whenever you hold up US dollars, to The sunshine, the security threads must appear to be a part of the Take note, rather than getting printed on it. With regard to edge reeding, this is another area where forgers frequently appear up small. https://amphetamine-and-dextroamp78027.onzeblog.com/33714223/the-5-second-trick-for-fake-us-dollar-bills