Optical variable ink (OVI) and solar photosensitive ink (SPI) are both types of security inks that are used to prevent counterfeiting. OVI inks change appearance when viewed from different angles, while SPI inks change appearance when exposed to ultraviolet (UV) light.

Optically variable inks were first used in the anti-counterfeiting printing of banknotes, checks, bonds and other securities. With the continuous development of science and technology, optically variable inks are not only used for anti-counterfeiting printing of trademarks, but also for surface decoration of special products. The reason why the optically variable ink has the corner-changing color characteristic is that a pigment with a very special structure is used, and its particles are very thin flakes with a good particle size distribution. The production process of the pigment is as follows: under high vacuum conditions, according to the design requirements of a specific film structure, a variety of materials with different refractive indices are sequentially deposited on the same carrier to form an optically variable film, and then undergo crushing, grading, surface treatment, etc. . When the thickness of the film layer meets the interference conditions of light, the film layer will show a photochromic effect, that is, its color will change as the viewing angle of the human eye changes.

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Optical variable ink is the most complicated intervention type Special ink. The printing products using this ink has colorful metal luster in which color lump shows a pair of colors.

Optically variable inks are also called optically variable inks and chameleons. The printed color blocks present a pair of colors, such as: red-green, green-blue, gold-silver, etc. When looking at the front or the side under white light, with the change of the viewing angle of the human eye, it presents two different colors, with strong light variation characteristics, large chromatic aberration changes, and obvious features, which can be identified without any equipment and equipment, and its color angle effect cannot It is reproduced with any high-definition scanner, color copier and other equipment. The printing characteristics cannot be imitated by any other ink and printing method. The anti-counterfeiting reliability is extremely strong, so it is designated by many countries in the world for the most stringent and difficult requirements. For the anti-counterfeiting of the largest currency and negotiable securities, some well-known manufacturers in China have also used it for packaging anti-counterfeiting.

Optically variable inks are also called optically variable inks and chameleons. The printed color blocks present a pair of colors, such as: red-green, green-blue, gold-silver, etc. When looking at the front or the side under white light, with the change of the viewing angle of the human eye, it presents two different colors, with strong light variation characteristics, large chromatic aberration changes, and obvious features, which can be identified without any equipment and equipment, and its color angle effect cannot It is reproduced with any high-definition scanner, color copier and other equipment. The printing characteristics cannot be imitated by any other ink and printing method. The anti-counterfeiting reliability is extremely strong, so it is designated by many countries in the world for the most stringent and difficult requirements. For the anti-counterfeiting of the largest currency and negotiable securities, some well-known manufacturers in China have also used it for packaging anti-counterfeiting.

Optically variable inks are also called optically variable inks and chameleons. The printed color blocks present a pair of colors, such as: red-green, green-blue, gold-silver, etc. When looking at the front or the side under white light, with the change of the viewing angle of the human eye, it presents two different colors, with strong light variation characteristics, large chromatic aberration changes, and obvious features, which can be identified without any equipment and equipment, and its color angle effect cannot It is reproduced with any high-definition scanner, color copier and other equipment. The printing characteristics cannot be imitated by any other ink and printing method. The anti-counterfeiting reliability is extremely strong, so it is designated by many countries in the world for the most stringent and difficult requirements. For the anti-counterfeiting of the largest currency and negotiable securities, some well-known manufacturers in China have also used it for packaging anti-counterfeiting.

Optically variable inks are also called optically variable inks and chameleons. The printed color blocks present a pair of colors, such as: red-green, green-blue, gold-silver, etc. When looking at the front or the side under white light, with the change of the viewing angle of the human eye, it presents two different colors, with strong light variation characteristics, large chromatic aberration changes, and obvious features, which can be identified without any equipment and equipment, and its color angle effect cannot It is reproduced with any high-definition scanner, color copier and other equipment. The printing characteristics cannot be imitated by any other ink and printing method. The anti-counterfeiting reliability is extremely strong, so it is designated by many countries in the world for the most stringent and difficult requirements. For the anti-counterfeiting of the largest currency and negotiable securities, some well-known manufacturers in China have also used it for packaging anti-counterfeiting.

Optically variable inks are also called optically variable inks and chameleons. The printed color blocks present a pair of colors, such as: red-green, green-blue, gold-silver, etc. When looking at the front or the side under white light, with the change of the viewing angle of the human eye, it presents two different colors, with strong light variation characteristics, large chromatic aberration changes, and obvious features, which can be identified without any equipment and equipment, and its color angle effect cannot It is reproduced with any high-definition scanner, color copier and other equipment. The printing characteristics cannot be imitated by any other ink and printing method. The anti-counterfeiting reliability is extremely strong, so it is designated by many countries in the world for the most stringent and difficult requirements. For the anti-counterfeiting of the largest currency and negotiable securities, some well-known manufacturers in China have also used it for packaging anti-counterfeiting.