: Hongkong Olympic Games Commemorative Banknote used embossing contact denomination digital anti-counterfeiting technology. In Hong Kong and Macao coins left watermark pattern above, the Bank of China emblem below, when the money placed eyes parallel to 45 ° or 90 ° rotation of different shapes, visible denomination figures "20" logo. The invisible denomination numbers using the tenon type stamping production, is the use of making good die stamping banknote paper, so that the banknote paper surface concavo-convex ordered wrinkles, thus forming a kind of fixed pattern, in order to achieve the purpose of security.
