Peking University Deli Technology Co., Ltd. has introduced a special security ink for invisible bar code. According to reports, the invisible bar code anti-counterfeiting technology is a new type of anti-counterfeiting technology combining advanced bar code coverage technology and bar code scanning technology. It reads the information under the overlay through a dedicated bar code scanner or observes the under-coverage layer on a monitor through a dedicated camera lens. Image information. Peking University Deli ink uses high-tech security materials, high-performance resin materials and advanced production technology. The product is a solvent-based ink with good printability and drying properties. It is suitable for overlay printing of various standard bar code and logo information graphics, covering black and blue colors. When printing, use 200-240 mesh screen plate, stir it well before use, generally do not need to make adjustments. This product can also increase the fluorescent anti-counterfeiting function, showing bright red fluorescence under the irradiation of ultraviolet light. If necessary, it can also be adjusted to use with water-based inks.