Ultraviolet seal is a kind of seal made of ultraviolet excited fluorescent anti-counterfeiting hot stamping ink. When the fluorescent anti-counterfeiting ink is injected into the seal, the appropriate pressure will seep out, and under the irradiation of ultraviolet rays, the fluorescent mark will appear. Fluorescent ink has waterproof function and can be printed on paper, human skin and so on.

There are two kinds of ultraviolet seals: one is colored and the other is colorless and invisible. Colored seals are filled with visible pigments, such as red; Black; Blue colorless invisible seal, invisible to the naked eye after printing, or slightly milky white. This kind of seal is mostly used on invisible signs.

These two kinds of seals are mainly due to the anti-counterfeiting effect of fluorescent anti-counterfeiting ink and inkpad, and the fluorescent imprint can only be observed under ultraviolet light.

This makes it difficult for counterfeiters to achieve the purpose of counterfeiting. Invisible seal/steganography and trigger mode are confidential, with high anti-counterfeiting performance. In the State Council, the public security bureau and important institutions all adopt this kind of ultraviolet anti-counterfeiting seal, and the production/manufacture of ultraviolet printing oil needs the approval of the public security bureau. Reference: I thought about this business, but I didn't approve it. Hey! ! ! ! Just go to the bar and drink. There are some in the bar.