copyright pens are an incredible start line because they are simple to operate. On the other hand, this kind of detector will not Focus on bleached bills. As an ordinary means of counterfeiting, bleached bills Have a very reduce denomination's printing bleached off, then are re-printed with an increased denomination. https://antibreezebanknotes85921.blogoscience.com/45488852/an-unbiased-view-of-how-copyright-pens-detect-copyright