>'MrMouse says his single-ply bills do not have magnetic ink, and so they won’t pass machines designed to look for the presence of this feature.'<p>Clever tip for detecting counterfeits, found in comments:<p>>'A good strong, neodynmium cylindrical magnet stuck to the side of something is a great way to check US currency. Just hold a bill by the corner and dangle it close to the magnet. The bill will show a slight, but very observable attraction. Easy and fast.'