Optical variable ink is one kind of special security ink which will change color with different viewing angle.
Uv ink is a special printing one giving off visible light (400-800nm) while exposed to ultraviolet light (200-400nm).
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PingWei Anti-forgery Ink Limited Security Inks are used to invisibly mark surfaces by using a wide range of technologies and printing processes. These Security Inks are used in all sizes of trade mark and by governments as an anti-counterfeiting and fraud prevention device. In the world we live in today, counterfeiting is a fast growing problem, which is measured in billions of dollars of lost revenue annually. .
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