Overt (visible to the naked eye) technology is used as a method of verifying the authenticity of a document. There are four important factors to consider when choosing a technology to protect against counterfeiting: 1. Ease of understanding by both the customer and the examiner 2. Ease of verifying authenticity 3. Difficulty of imitation 4. Level of protection required The biggest advantage of overt technology is that no special equipment is required to determine authenticity, thus making it easy to understand and verify, as well as being very hard to imitate. One example of this technology is Optically Diffractive (OD) Ink – which changes colour depending on the angle at which it is viewed. There are many other different types of overt technology , if you are interested in learning more please contact one of our sales executives or email marketing@chanwanich.com