? With the large number of high-security documents such as checks, banknotes, passports, and credit cards being forged, industry has been looking for new technologies in the optical field that can successfully protect documents from being copied. Optical color-changing inks have this feature, which successfully protects high-security documents from being forged. Today, in terms of passports or credit cards, more than 50 countries around the world use anti-counterfeiting technology with color corners as a means of counterfeiting to achieve the purpose of anti-counterfeiting.What is Optical Color-changing Ink

? Optically Variable Ink is a type of printing ink that contains a high-precision interference filter in a microstructure and that displays two different colors at different angles.

? The color-changing properties unique to optical color-changing inks have been selected by more than 50 countries for currency counterfeiting. This ink exhibits different color changes at viewing angles of 900 and 300, thereby ensuring that colors are not copied.

? This high-performance interference filter used in optical color-changing inks is made by precision vacuum deposition on roller coating equipment. This raw material must be able to achieve its maximum optical characteristics to achieve the desired anti-counterfeiting effect. Mica or quartz materials that have been wetted have this characteristic.

? The optical properties of pigment particles enable them to produce strong color transition properties (colors are produced by physical phenomena). Pigment particles are only about 1μm thick and 20μm wide. The principles of reflection, absorption, incidence, and interference are roughly the same.

? It can be seen that only when accurate to each layer of the material allows us to use physical phenomena to analyze ink. Optical color-changing inks are based on interference color filters manufactured in a vacuum memory to exhibit this color conversion characteristic of inks, but are confused about the choice of this color conversion material. Generally speaking, the performance of synthetic metal media is much better than that of full media. This is because metal media have high opacity and high cost performance.

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